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CAE with Armin Hashemi
США
Добавлен 8 дек 2013
Hello and welcome, I'm Armin, and I record ANSYS and COMSOL Tutorial Video. My major fields are sound and vibrations.
سلام، من آرمین هستم. تخصص من صوت و ارتعاشات است. برای مشاهده رزومه و همکاری لطفا وارد وبسایت من شوید
سلام، من آرمین هستم. تخصص من صوت و ارتعاشات است. برای مشاهده رزومه و همکاری لطفا وارد وبسایت من شوید
COMSOL Project 4: Modal Analysis of Room (Acoustic Impedance)
In this video, I demonstrate how to calculate the natural frequencies of a room, incorporating absorption coefficients for materials like the sofa, floor, and ceiling. We'll systematically explore the process, from defining the geometry to setting up the Impedance boundary conditions. You'll see how absorption impacts the room’s acoustics' natural frequencies. Perfect for those interested in acoustics simulation and learning how to work with absorption coefficients in acoustic analysis. Don’t forget to subscribe for more tutorials!
you can download the model from the below link
www.dropbox.com/scl/fi/r6v259ko5l9kwoqqiqtw8/Modal-room.mph?rlkey=df2mz537n2hec2chavh5smxck&dl=0
Follow my LinkedIn...
you can download the model from the below link
www.dropbox.com/scl/fi/r6v259ko5l9kwoqqiqtw8/Modal-room.mph?rlkey=df2mz537n2hec2chavh5smxck&dl=0
Follow my LinkedIn...
Просмотров: 59
Видео
COMSOL Project 3: Acoustic Waves in Air and Water
Просмотров 9514 дней назад
This tutorial shows the speed of sound in air and water using the "Pressure Acoustics, Transient" physics interface in a time-dependent study. I also show how to add annotations to write text within the geometry domain for better visualization and understanding. you can download the model from the below link www.dropbox.com/scl/fi/wfy6f005xd05p4wtbjqtb/Sound-propagation-in-air-and-water.mph?rlk...
Mastering COMSOL: Dew point & Relative humidity
Просмотров 96Месяц назад
This COMSOL Multiphysics tutorial will focus on calculating psychometric properties such as dew point and relative humidity. We will utilize Heat Transfer in Solids and Fluids physics and incorporate a moist air domain in the example. The ambient properties of California weather will be used in the analysis. Download the model from the link below (Version 6.2) www.dropbox.com/scl/fi/n1rlc8n74lm...
Mastering COMSOL: How to Use Material Sweep
Просмотров 1762 месяца назад
Welcome to COMSOL Multiphysics tutorial! In this video, we will walk you through the process of using the Material Sweep feature. This powerful tool allows you to analyze the impact of different materials on your simulation model. We will demonstrate this by using three different materials in our example. you can download the model from here (V6.2) www.dropbox.com/scl/fi/9ou530168qpo7wly303f1/M...
Mastering COMSOL: How to Use Probes
Просмотров 3652 месяца назад
COMSOL Probe Probes are valuable tools for obtaining results in points, boundaries, and domains. In this tutorial, you will learn how to use point probes, boundary probes, and domain probes to analyze results in a 2D geometry. Watch the tutorial for this model at the following link: ruclips.net/video/gSKZ9zwWqIM/видео.html Download link of COMSOL file (V6.2) www.dropbox.com/scl/fi/pyjqdnk44xhnx...
Ansys Project II: Arch bridge analysis (convert 3D solid to 1D beam)
Просмотров 1283 месяца назад
This Ansys tutorial focuses on modal and static strucural analysis. you will learn in this video how to convert a 3D solid bridge to 1D beam elements; How to perform modal analysis and static structural; how to exract beam results and factor of safety. Geometry link in Grabcad grabcad.com/library/arc-bridge-2 If you found this video helpful, please give it a thumbs up, subscribe to our channel ...
Mastering Ansys: Sound absorption coefficient with JCA model
Просмотров 4353 месяца назад
This ansys tutorial is about calculating the sound absorption coefficient with the Johnson-Champoux-Allard (JCA) model. I use ansys workbench and harmonic acoustics system in this model. Also, I use spaceclaim to create impedance tube geometry. This model requires five parameters for material, which I used from an academic paper. You can download the article from the link below hal.science/FA20...
Ansys Project I: Acoustics of Helmholtz Resonator
Просмотров 6463 месяца назад
Helmholtz resonator is widely used to reduce sound at a specific frequency. In this Ansys tutorial, you will learn how to calculate sound transmission loss and absorption coefficient of a Helmholtz resonator in Ansys. 9 Hertz disparities between simulation and analytic results are observed. A porous material is also used in the resonator. perforated medium is modeled by Delany Bazley method. If...
COMSOL Project 2: Acoustic of Helmholtz Resonator
Просмотров 5194 месяца назад
Helmholtz resonator is widely used to reduce sound at a specific frequency. In this tutorial, you will learn how to calculate sound transmission loss, reflection, and transmission coefficients. 10 Hertz disparities between simulation and analytic results are observed. A porous material is also used in the resonator. you can download the model from the below link www.dropbox.com/scl/fi/hyile2k7q...
COMSOL Project 1: Monopole sound source and acoustic barrier (Part II)
Просмотров 4104 месяца назад
This free tutorial is about simulating a monopole sound source in a free-field environment with a barrier in front of it in COMSOL Multiphysics. The tutorial is divided into two parts. in part I, the barrier is rigid. This is the second part and the barrier is flexible. please watch the part I first ruclips.net/video/gSKZ9zwWqIM/видео.html In this part, you will learn how to couple pressure aco...
COMSOL Project 1: Monopole sound source and acoustic barrier (Part I)
Просмотров 7754 месяца назад
This tutorial is about simulating a monopole sound source in a free-field environment with a noise barrier in front of it in COMSOL Multiphysics. The tutorial is divided into two parts. in the first part, the barrier is a rigid wall and in the second part, the barrier is flexible. you will learn how to define a monopole source and perfectly matched boundary in pressure acoustics physics. Also, ...
Mastering ANSYS: prestressed modal analysis metal wire
Просмотров 2705 месяцев назад
This tutorial focuses on the prestressed modal analysis of a metal wire. We need to couple static structural analysis with modal analysis. Additionally, I have calculated the modal analysis of the metal wire to compare the results of the two models. we concluded that tension will increase the amount of natural frequencies. If you found this video helpful, please give it a thumbs up, subscribe t...
صفر تا صد کامسول: قسمت نهم (COMSOL Persian)
Просмотров 1395 месяцев назад
هشتمین قسمت فارسی آموزش کامسول. در این مجموعه قصد دارم که کامسول را از ابتدا به شما به زبان فارسی آموزش دهم. آموزش از رسم هندسه شروع میشود و تا مدلسازی و رسم نتایج ادامه مییابد. لطفا تمام ویدئوها را ببینید. در این قسمت حلگر time dependent modal را بررسی میکنم که پاسخ را در حوزه زمان بر اساس مجموع شکل مودها استخراج میکند. همچنین زمان حل کوتاهتری نسبت به حلگر time dependent دارد. در پایان هر...
Mastering ANSYS: Bimetallic thermal expansion
Просмотров 4325 месяцев назад
This tutorial explains the thermal expansion of two coaxial shafts made of an inner aluminum shaft and an outer steel shaft. The steady-state thermal and structural static toolboxes are coupled, and the thermal results are imported into the structural steel. Two methods were used: contact between two metals and share topology. the comparison shows a 3.5% difference in results. If you found this...
صفر تا صد کامسول: قسمت هشتم (COMSOL Persian)
Просмотров 1495 месяцев назад
هشتمین قسمت فارسی آموزش کامسول. در این مجموعه قصد دارم که کامسول را از ابتدا به شما به زبان فارسی آموزش دهم. آموزش از رسم هندسه شروع میشود و تا مدلسازی و رسم نتایج ادامه مییابد. لطفا تمام ویدئوها را ببینید. در این قسمت حلگر time dependent را آموزش خواهم داد و پاسخ ارتعاشی دو نقطه از ورق را در حوزه رسم خواهم کرد. دامنه ارتعاشی با حل در حوزه فرکانس مقایسه شده و اندازه یکسانی دارند. شما میتوان...
ANSYS mesh: Watertight workflow polyhedra and poly-hexcore
Просмотров 3605 месяцев назад
ANSYS mesh: Watertight workflow polyhedra and poly-hexcore
صفر تا صد کامسول: قسمت هفتم (COMSOL Persian)
Просмотров 1875 месяцев назад
صفر تا صد کامسول: قسمت هفتم (COMSOL Persian)
ANSYS mesh: Savonius turbine in Watertight workflow meshing
Просмотров 2426 месяцев назад
ANSYS mesh: Savonius turbine in Watertight workflow meshing
Mastering COMSOL: sound absorption coefficient BIiot Allard model
Просмотров 4616 месяцев назад
Mastering COMSOL: sound absorption coefficient BIiot Allard model
Mastering COMSOL: Acoustic Impedance JCA theory
Просмотров 5636 месяцев назад
Mastering COMSOL: Acoustic Impedance JCA theory
صفر تا صد کامسول: قسمت ششم (COMSOL Persian)
Просмотров 1547 месяцев назад
صفر تا صد کامسول: قسمت ششم (COMSOL Persian)
Mastering COMSOL: Thermoviscous acoustics part II
Просмотров 3297 месяцев назад
Mastering COMSOL: Thermoviscous acoustics part II
Mastering COMSL: Thermoviscous acoustics (Part I)
Просмотров 3867 месяцев назад
Mastering COMSL: Thermoviscous acoustics (Part I)
ANSYS tips: change number of processors (cpu)
Просмотров 1,3 тыс.7 месяцев назад
ANSYS tips: change number of processors (cpu)
Mastering COMSOL: Cut line and cut point
Просмотров 1 тыс.8 месяцев назад
Mastering COMSOL: Cut line and cut point
صفر تا صد کامسول: قسمت پنجم (COMSOL Persian)
Просмотров 1838 месяцев назад
صفر تا صد کامسول: قسمت پنجم (COMSOL Persian)
Mastering ANSYS: solve high stress issue
Просмотров 2869 месяцев назад
Mastering ANSYS: solve high stress issue
Mastering COMSOL: Conjugate heat transfer & parameter sweep
Просмотров 5949 месяцев назад
Mastering COMSOL: Conjugate heat transfer & parameter sweep
صفر تا صد کامسول: قسمت چهارم (COMSOL Persian)
Просмотров 2489 месяцев назад
صفر تا صد کامسول: قسمت چهارم (COMSOL Persian)
صفر تا صد کامسول : قسمت سوم (COMSOL Persian)
Просмотров 1989 месяцев назад
صفر تا صد کامسول : قسمت سوم (COMSOL Persian)
Hello, I want to say that this example is spectacular! I was wondering if you would make a model showing how acoustic wave model works in fluent?
@@TheyCallMeApplePie hello, thank you for your suggestion. I will record it in my spare time
سلام وقت به خیر جناب هاشمی تشکر بابت کلیپهای آموزشی امکانش هست آموزش شبیهسازی مبدل اولتراسونیک تانپیلز رو هم آموزش بدید؟ شما تدریس شخصی یا پروژه هم انجام میدهید؟
@@aminghasemzadeh5462 سلام خواهش میکنم. اگر وقت آزاد شد حتما.
@@caewitharminhashemi بسیار عالی موضوع پایان نامه بنده طراحی یک مبدل تانپیلز هست من مبدل رو با مدار معادل شرمن باتلر بهینه سازی کردم که بیشترین پهنای باند رو داشته باشه بعد مبدل بهینه شده رو با روش مدار معادل میسون مدلسازی کردم الان باید مبدل رو تو کامسول شبیهسازی کنم اگر ممکنه میخواستم از شما راهنمایی و کمک بگیرم تشکر
@@aminghasemzadeh5462 من زیاد آشنایی با کار شما ندارم. ولی ایمیل و تلگرام من توی سایت هست. میتونید پیام بدید
👌👌👌
@@zahraelyasvand6056 thank you
sir please suggest me channel where i can learn electrodynamics Physics using Comsol software.
@@muhammadnisarqasim636 Hello, unfortunately, I don't know. My expertise is in mechanics, so it would be better to consult someone with a background in electronics.
Hi sir, i am learning from this but if i change the material property of my sample, the results are not changing. Both air and sample are part of acoustic region. Should i select sample also when i am creating port. thank you
Hello. The absorption coefficient in the JCA model depends on five parameters. If you adjust any of these parameters, the results will change accordingly.
@@caewitharminhashemi Thanks for the reply and this video. I was searching for a tutorial in internet. This video helped me to learn numerical simulation.
@@SumandeepSinghRana you're welcome.
Please make a video on evaporative cooling also
@@the24thintrovert okay. Thank you for your suggestion
Nice video
how did you set the co-ordinates for the recivers to locate over the propeller can you help me sir or anyone who knows that thing
There is a circle with a diameter of 2 meters, which is far from the center of the propeller.
can you use this method in heat and mass transfer and drying problems?
@@k.m3129 of course, I will record a video about it in the future
I want to thank you for your interesting content and would like to ask for your help in modeling carbon nanotubes on Comsol Multiphysics.
@@abderrahimbarhoumi9003 you're welcome. I haven't any experience in nanotubes. If your model is prepare and has some issues, email it to me and I'll check it
Hello sir, if i want to include the transmission coefficient of this barrier in the simulation how can i add it...what are the changes required while simulating.
Hello. I haven't calculated before. You should look up in books.
@@caewitharminhashemi Yes sir analytically i can do. Thanks for your guidance.
Hi Armin. How's everything? The video is very good. I would like to ask for a video suggestion: validation of the acoustic simulation (Pressure Acoustic) from the article entitled: "Simulation of Partial Discharge Acoustic Wave Propagation Using COMSOL Multiphysics and Its Location in a Model Transformer Tank". Thank you so much!
Hallo. Thank you for your suggestion. These models are very time-consuming and have few viewers because they are specialized.
@@caewitharminhashemi Thank you very much for your attention! <3
Superb tutorial thank you very much! I have some problem where the SPL results in CFD-post are showing negative values, which is unexpected. My simulation setup is exactly the same as yours and I used the DJI propeller blade as well. I've been searching for solution for quite a while and the only answer I've got is that I have to change the reference pressure. So I tried 3 different reference pressure: 0 Pa, 20 micro Pa and 1 bar but the SPL results are still negative. Could you please give me some guidance on this matter? Thank you very much!
Hello. Check yplus it must be below 2. What is your fluid model?
Hi sir, while going through one research paper on barrier simulation, source was defined outside the domain and scattered field formation was given to define distribution of noise inside the domain..will you pls tell how to give that kind of condition?
Hello. I did understand. What do you mean source is outside the domain?
Great tutorial! Thank you!
@@chris57926 you're welcome
Hi, I do exactly the same steps as you do and i get this error "The input power at the driven port is equal to zero. Please check the port definitions." Do you know what might be causing it?
@@juanmanuelorlandomelidoni9110 I think you forgot to enter pressure amplitude in the inlet port
@@caewitharminhashemi No its defined as 1Pa
@@juanmanuelorlandomelidoni9110 unfortunately I have no idea
Can you do the video about the material sweep please? Thank you.
Of course. I have a video but it needs edit. I'll upload it ASAP
Hi sir, you mention that the other cylinder have rigid boundaries. So, do we need to apply rigid wall on its surfaces?
All boundaries are rigid by default in acoustics system. No need to define rigid boundaries
Another question sir. Is it possible if i apply surface velocity and radiation boundary at the inlet face? Or we can ignore it?
@@nurulsyafina1086 absorption coefficient is independent of inlet. Port boundary is defined to calculate absorption coefficient and no need to other boundaries
Hi, I seem to have some error in my solution. When i plot pathlines of velocity, there is a sudden change in particle trajctories. before mrf region my trajectory coincides with axis of proppeler's rotation, subsequently it experiences a swirl inside MRF region, and then suddenly while exiting the MRF trajectory suddenly straightens. Do you happen to have an idea where the root of the error might be
Hello. Please email me some photos of path lines. Armin.hashemi.k@gmail.com
Hello sir will you please put a video to see the combined effect of a microperforated plate along with porous absorber.?how to combine two physics together to get net effective absorption coefficient?
Hello. add a interior perforated plate boundary on the poroacoustics domain. it's not complicated.
@@caewitharminhashemi ok sir i will try. Will you pls share your email ?
@@caewitharminhashemi sir so is it possible to implement in 3 D. as well also do I have to use MAA's equation for that.. only this boundary condition is sufficient?
@@PriyankaSuryawanshi-if7du I suggest that you solve model with the perforated boundary condition first. 3D model is another scenario and needs another physics in comsol. The Maa equation is not available in Comsol
sir do we have to model this as 2D?
If we replaced this geometry with perforated plate like structure then what Boundary condition do we need to apply at the empty surface. That's is my concern. Please help me out.
It is a 3D crystal modeled in 2D and depth is not taken into account. You need to model the perforated plate in 3D.
Thanks alot sir. Keep doing the work. Make more videos because it helps alot. ❤❤❤
Thank you. of course
Install 6.2 version but software is not open plz how can it solved it 😞
Hello. It is installed like the previous versions. What is the problem with the installation?
Install but software was no open
Yes previous version 6.1 are open but this version are not be work sir
Maybe the software has a problem.
Mat be sir
باسلام، در زمینه Acoustic خودرو هم آموزش کامسول میزارید؟
سلام. مشخص نیست هنوز.
how do you make composite but not in layer form?
Sorry I don't understand what you mean.
Hi Armin, how are you? I have a question about impedance. I was reading this article titled "Static flow resistivity measurements based on the ISO 10534.2 standard impedance tube" and I would like to calculate the resistivity to the flow using the impedance formulas that the author brings to the text, in COMSOL. I believe that one of them you already presented in the video, but the others I am not able to do. Could you help me , please? Can you use the same geometry as in your video.
Hello. how can i help you
@@caewitharminhashemi Hi Armin. Thanks for answering. I would like you to help me put in COMSOL (in the variables part) the impedance that appears in the article I mentioned. I didn't want to bother you, you taught me a lot but I have doubts about how to put this variable that appears in the article in COMSOL.
@@gabrielhernandezrozo848 please email me article.
@@caewitharminhashemi I sent you the article by email.
In the transient calculation process, my convergence is very fast and very stable, but when the calculation is more than 80%, the residual suddenly rises tens of thousands of times, and the monitoring of the rotor thrust value also changes to tens of thousands N. Do you know the reason🤔
It happens sometimes. Because mesh motion is used. In the steps interval that diverges, increase the residual value. After passing that interval, return it to the first values.
@@caewitharminhashemi Thank you for your reply. When I met this situation for the first time, your way can solve the problem effectively. But when I ran into the problem the second time after 60 more steps, I tried to raise the residuals to 0.1,10,100, 10,000, but still couldn't diverge after calculating up to 12 steps. And the residual value is getting larger and larger.🥺
@@JjownO check mesh and time step. problem is due to one of these
Hi, is it possible to do prediction of noise of subsonic get from nozzle using the similar setup as in the video?. Thank you for the video. Why did you not choose to use FW-H surfaces for this model
Hello. If the propeller tip Mach is low. No need to define a surface (permeable FWH) because the quadrupole sound source is weak. You have to define surface in jet noise calculation because quadropole source is dominant
@@caewitharminhashemi Thanks a lot for your explanation.
I have few doubts regarding comsol acoustics. How can we reach you. Email ? Please
Armin.hashemi.k@gmail.com
@@caewitharminhashemiI also have some questions, may I ask you for advice?Thank you for your reply.
@@user-kx1jm4zx8k hello. of course
@@caewitharminhashemi It‘s so great,thank you.
hi armin can u please do video on resonator absorption coeff. how to find impedance in resonator setups etc.please
Hello. I will record it in the future
can you do simulation of detect cracks in composite material (carbon fiber ) by coil , please by comsol multiphasic
It's not my speciality. Maybe one day i made it
@@caewitharminhashemi ok thanks anyway
Do you achieve that?
thank you for the tutorial. I was trying to do mesh refining. However, in the step at 5:22 I am getting this warning: (The surface meshing was not successful. Import the CAD outside the workflow and use Diagnostics to identify problematic faces) What could br causing the problem?
I think you should clean up your geometry.
@@caewitharminhashemi do you mean to use the command fill in spaceclaim?
@@omerabdo8674check extra edges, holes, inexact edges, etc
@@caewitharminhashemi btw I am using the same geometry you gave in the discription
@@omerabdo8674 i have no idea.
Excellent I didn't understand what you put values on inlet and outlet boundary conditions? Can i do it for my axysymetry propller by one blade??
Inlet and outlet are pressure outlet. You can add a inlet velocity if the propeller moves in air.
No. You cannot use symmetry or periodic boundary condition in mesh motion. It uses in stationary solution.
@caewitharminhashemi thank you🙂↕️ So I can't simulate the noise of one blade.🥲 All of it has to be.
Hi, greetings Somebody know if theres this very tutorial but in a 3D example? It would mean a lot to me if someoane had a 3D drag analysis for comsol
Hello. You can use it in 3D space. There is no particular difference.
alpha = 1-R, or alpha = 1-R^2..? which one is correct?
R is reflection coefficient. Pressure reflected to pressure incident. Here I used power, not pressure (p). Therefore alpha =1-R. Power is proportional to p^2.
Well noted. Thanks. I have one more question. If we calculate the reflection coefficient (R) from surface impedance (Zs), is it possible to realize it in Comsol?
@@BondanDwisetyo yes. There are several examples in Comsol library
Thank you bro
You're welcome
Thank you very much, perfect explanation
You're welcome
Thank you so much,i have a question please,why p0 =1
Hello. Sound transmission loss is independent of acoustic pressure. Therefore, whatever number you enter, the result is the same
Hi Armin, how are you? I would like to know if it is possible for you to record a video teaching us how to calculate the tortuosity of a porous medium using COMSOL. Thanks!
Hello. Thank you for your comment. Okay
Thank you so much for your explanation sir. I would ask, what is the meaning of arc length? In your video, It shows 1 meter (in unit) Your model has 3 meters in length and 0.1 meters in width. Could you mind to explain where the 1 meter in arc length come from? Thankyou
Hello. Arc length is 0.1 meters in x axis. This is length of cut line
@@caewitharminhashemi Thankyou Sire. Could mind to give us a tutorial for measure droplet diameter by cut line plot in COMSOL? Especially in microfluidics
Hello sir how can we model sandwitch barrier model consisting of two layers of aluminium sheets with some porous material in between?
Hello. Create three layers. Two layers for aluminum sheets and one layer for poroacoustics material.
Ok I will try.@@caewitharminhashemi
Thank you
Why can't I set the buffer layer when generating the volume grid ?No buffer layer setting in my fluent!
Did you use body of influence?
Yes!
@@JjownO You cannot use both. Remove boi to access buffer layers
@@caewitharminhashemi thank you!
سلام خیلی ممنون از تولید محتوای مفیدتون، یسوال داشتم اینکه چطور در حالت دو بعدی برای طراحی دیوار صوتی، در سمت راست دیوار صوتی یک گیرنده تعریف کنم و صدای دریافتی توسط گیرنده رو بخونم و با فرکانس های مختلف پلات کنم؟ مشکلم در تعریف گیرنده است
سلام، خواهش میکنم. سادهترین را اینه که یک پراب از قسمت definitions اضافه کنید و برای آن SPL را تعریف کنید. مکانش هم میتونید تغییر بدید.
دستتون درد نکنه، چجوری منبعی که صدا تولید میکنه را قدرتش را بر حسب spl بدم؟ خودتون تو آموزش بر حسب power وارد کردید @@caewitharminhashemi
@@MohammadHoseinAhmadi-io6yy تا جایی که یادمه برحسب فشار دادم و سه در سه جهته. فشار را باید بر حسب پاسکال وارد کنید. اگر بر حسب دسیبل دارید باید آن را تبدیل به پاسکال کنید
Great Tutorial...Great Teacher...You should look to create courses on platform alike Coursera/Udemy etc.... Mind sharing the cad model??
Thank you. I'm only a simple engineer. I downloaded this propeller from grabcad website. I don't remember exact name of model. As I know it's DJI propeller.
very nice video
Thank you 🌹
That was great.
Thank you
Hello dear Armin. Your videos are really useful. Thanks. Great work. Keep going. Good luck.
Hello. Thank you very much 🌹
قسمت های بعدی هم استارت بزن مهندس(مخصوصا تحلیل میدان الکتریکی)، متشکر
ممنون از شما. الکتریک را باید یکی بگه که رشتش باشه. من مکانیک خواندم و همین همین مباحث را آشنایی دارم.
Hello, would it be possible to do just the acoustic study? A plane wave source interacting with a structure and at the end of the domain containing a rigid wall?
Yes.
Also sir can we specify Fresnel no and find out insertion loss as well?
I haven't seen frensel number in results. Maybe you should define it. Yes you can calculate insertion loss.