Star-CCM+ Tutorial 1- Cooling a 2 CPU System (Conjugate Heat Transfer Case Analysis)
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- Опубликовано: 18 апр 2020
- Hello,
My aim with this video is to teach you how to draw sketches and create bodies in CAD while showing you how to use Boolean Operators available in the program. Also, you will learn how to transfer the CAD to simulation through creation of Regions and Interfaces between surfaces. Finally, you will learn how to create scenes and reports which will help you to see your results.
The overall quality is not the best out there, but I sincerely hope this video will help you. I will try to get better with the other cases that I'm working on; however, I think I did a pretty decent job here. If you have any recommendation to improve the quality, please feel free to comment or contact me.
You can also refer to this tutorial link here : • Flow Investigations wi...
![[CFD] Convection (Heat Transfer Coefficient) Boundary Conditions](http://i.ytimg.com/vi/ygR31_vhvJI/mqdefault.jpg)
Great content, it helps a lot for those learning how to use star ccm+ to create thermal management solutions. I am currently doing the siemens course on the fundamentals of the heat transfer package of star ccm+, and this tutorial of yours is a great complement for it. Thanks a lot for the effort mate, I really appreciated the video and got positive insights from it.
Absolutely awesome and helpful video! Impatiently waiting the other tutorials. Thank you very muchh!
Thank you for this tutorial. You've told everything in detail. Thank you for the effort!.
Yo great content! Starccm is starting to make more sense for me. Thanks!
Hello sir thanks for posting such a deep tutorial. Please keep posting, it helps a lot.
Nice tutorial, please keep uploading more videos!! Very helpful for us researchers. Thank you for your effort...
Thank you for your kind words. Great to hear that I was able to help people=)
great content, i am wait for next your tutorial content about star ccm+
Thank you for your valuable time and effort. Waiting for new videos
Amazing video. Thanks so much for this.
Just continue to make new videos, this was great, thanks.
WOW! such a great and useful video.
Great content and it’s really helpful for us beginners . Creating and doing simulation with a case is good for us understanding the workflow. Thank u. Looking forward for your updating.
Btw, I am doing a heating system case. There is no fluid/gas in this system except environment. I have a problem that there is only energy on the residual plot (no appearance of continuity and others). Is it reasonable?
@@yajiaoliu5970 Ofcourse since you dont have any fluid there is no need for momentum transfer. This is the ideal case generally since addition of the fluid domain kinda causes problems in terms of multiple time scales (Somewhat the problem in the simulation I have done.)
@@ownershen97 Thank you for your kind reply!
very good tutorial ! thank you
Thank you sooo much!
You helped me in my master thesis!!!!!!
Glad it helped =)
Good luck with your thesis!
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Could you please explain, why you chose convection and assigned h = 0? Rather than just giving at adiabatic wall condition? - Are not both the same. Also how did the Energy Source option effect your boundary condition? I am talking about somewhere around 58:00
Hello. I noticed you had a folder for "Cooling Lithium Ion Battery". Im currently doing a project on this. If possible, can you make a tutorial or share files so i can go through them and learn from them? Thanks so much for this btw! Helped a lot.
Hi, first of all great video!
I just wanted to ask why do you set the heat transfer coefficients as 0 for all of them?
Hey, glad it helped =) The coefficients are 0 since we only want the fluid region to cool the CPUs. Otherwise giving a value to these coefficients will implement a cooling effect which will give wrong results.
Upload more thermal analysis of battery
what does thermal specification mean as convection with ambient 35 C and no convection for waterway? water way is not in contact with ambient only CHT should be happening. Please help, its not making sense.
Is it possible to import regions already designed in NX Siemens instead of designing them in STAR-CCM+? Great content btw! It helped me a lot!!!
You can indeed transfer CAD files from various programs where Star-CCM+ can distinguish parts provided that you have identified your part previously. Though I'm not sure about regions; I've never worked with NX Siemens (yet I think you meant parts?)
In fact I did few of my projects from Inventor 2019 and transferred them to Star-CCM+ no problem (saved as IGES file in Inventor and imported it in Star-CCM+). However, the issue is that there can be problems in the geometry where you may have to use Surface Repair Tools available in Star.
Thank you. Always happy to help =)
Please upload more videos
Please add more videos sir
Can you add the starcmm file too? Thanks for the video btw
Great idea, I will add it as soon as possible. Good to see you enjoyed it good luck =P
Hi can you show how to calculate Heat transfer coefficient for this problem
Hey
I suppose you are referring to the Heat Transfer Coeff. for fluid flow. You should first calculate the fluid's Re number to determine whether its laminar or turbulent.
Then, you can use predetermined formulas to calculate Nusselt number. Then, you can proceed to calculate heat transfer coefficient using previously found Nusselt number through a relation which I unfortunately don't have the memory of.
. You should take a look at Internal Forced Convection from various books. I recommend Heat and Mass Transfer_Fundamentals and Applications by Yunus A. Cengel and Afshin J. Ghajar (the book used in my uni) however most of the heat transfer books should cover this topic.
Hopefully this was helpful.
Take care
Hello Onur. I wanna know the reason of assigning the heat transfer coffeficent value as 0. Thanks.
Hello
The reason is that I assume that there is no forced convection over the surfaces of the system. (However, as you may know, there are fans that actually cool the CPUs down) So, I set the heat transfer coefficient (or convection coeff.) to 0 and let the liquid cooling do its thing and assess how well it cools the system.
Now, if you would like to see the effects of convection over the surfaces, then you can set the convection coefficient; however, you may want to make some analytical calculations/simple simulations to find out the coefficient. Then you can set the boundary condition for convection.
In addition, lets assume that I know the convection coefficient caused by the liquid inside the pipe. Then I do not need to assign a fluid region and only assign the coefficient at the inner wall of the pipe. This way, you can simplify your simulation and hence decrease computational costs.
Hope this helps =)
@@ownershen97 Hello Onur. I researched some thesis about radiators and have to create cfd simulation of a car radiator. If you have any information, Can you inform us briefly about this issue. How should I do this simulation. Thanks for your informing.
@@erenmeliksurmeli9796 Hello
I dont have much experience with car radiators but I think it would be fundamentally similar to this simulation. I suppose you can initially draw out the geometry of your radiator, extract the pipes/ducts from it for your fluid to flow through and create interfaces between the pipes and your radiator.
There is a tutorial exactly on this topic in star ccm+ help menu (under tutorials) called 'Duel Stream Heat Exchanger: Car Radiator.' If I remember correctly it implements some porous regions in it which maybe of use.
Cool, great for those who don't know star ccm but please be careful with the physics... Adiabatics wall is not a good boundary option for your copper pipe !
I could assign a convection boundary layer to assign the environmental temperature but I suppose it wouldn't make a huge difference regarding the temperature distribution throughout the system.
Thanks for the heads up though! :)
I ran into the issue of not having the same velocity magnitude for physics 1 initial conditions and water region inlet. Maybe I missed this in the video, but to anyone having trouble, this may be the solution!
Hello
The Velocity IC for fluid physics should be zero for better solution since the pipe does not run along a straight path.
For better clarification:
If you assign a initially velocity of 5m/s in X direction, every point in the fluid will be 5m/s in +X direction which is wrong in this case because there is a region where the fluid should flow in -X direction (because of the U bend changing the direction of the flow).
The problem here is that I gave the Courant number a considerably big value for faster solution time. Check 1:09:35 for Courant number. It should be around 1 for good solution; less than 1 for better yet longer solution time.
Hope this helps =)
Hello, I am a student who is learning star-ccm at university.
I can set the air to inlet and outlet, but I don't know how to give conditions when I change it to water.
I want to set the temperature of the water and see the temperature that the water has when it goes into the outlet. Can you take a video of the lecture?
Hello Vesper,
If you changed the fluid medium in Continua, then you won't have to take further steps for the boundary conditions. You can simply give temperature condition into the inlet and outlet boundaries. This can be done by going to the "Regions" tab and proceed to the region with inlet and outlets and change the conditions.
In order to monitor the temperature of the fluid near the outlet, you can create a point probe from the derived parts and place it near the outlet. Then, create a maximum (or minimum) report and choose that point you have previously created for the report. Finally, right click the report and say 'monitor and plot'.
@@ownershen97 I understand the inlet, outlet setting you mentioned before. However, as the fluid flows, the temperature of the fluid must be transferred outside or outside, and the remaining temperature must escape, which is the same. My condition is to flow water into the pipe and the inlet temperature of the water is 60℃.I'd like to check the remaining exit temperature after transferring heat, but the exit temperature is still 60℃.
p.s. If there is something I am doing wrong, could you please forward the ccm file and check the problem?
@@vesper_007 I suppose it could be due to failed interface between the fluid and the pipe. I could help you with the file yet I'm having trouble with licensing preventing me from opening SIM files. However, you can try the steps below and see if they work.
In the "Regions" tab, select the two boundaries (while holding control) shared by the fluid and the other object and right click one of them while they are both selected and select interface.
Or simply try the imprinting process I've shown in the video where the program creates contacts based on imprints made in CAD.
Also, do your residuals converge? The solution may not be correct as well due to increased transient heat transfer. You can change from "Steady" to "Unsteady" simulation in continua tab. Make sure all of the continua have the same option selected.
Hope this helps
sir please make all video to learn star ccm+ and as well as Task automation using python for Star ccm
Hello, I'll try to make more videos for sure;yet, unfortunately I do not have the knowledge to use Python to code for Star CCM+. Maybe in the future when I learn to code on Python =).
Thank you sir
1 CPU per 1 mio cells :)
CCM+ refuses to make any statement regarding pre-proc run mode, if serial or parallel, I personally run pre-proc in serial mode making use of Fluent experience.
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The most stupid idea to create CAD in Star. We need to learn how to setup not 3CAD modeling. What is the region what is continua what is difference? Do we need to extract fluid region?
The things you have mentioned are all in the video;yet, here is a summary:
1) Continua: Selection of physics/models you would like to utilize.
2) Region: Defined parts where the physics chosen in Continua will be solved.
3) The fluid region is extracted to specify it. Otherwise there won't be any fluid region.
It is better to create CAD in Star CCM+ as imported files can cause problems in which case you have to use surface wrapping/surface repair tools to fix the geometry. Of course, it is your choice to pick your CAD program.
Again, everything you mentioned is in the video... You should watch it carefully.