ANSYS Fluent Tutorial | Effect of Roughness of Pipe in Turbulent Flow Modeling | Roughness Modeling
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- Опубликовано: 11 сен 2024
- This tutorial is about roughness modeling in the turbulent flow in a pipe, 2 cases have been analyzed in the first case the flow is carried out in a rough pipe and in the second case, the flow is in a smooth pipe. In both cases, the pressure drop has been analyzed and compared.
What will you learn from this tutorial?
- Creating a fluid domain geometry.
- Roughness Modeling in ANSYS Fluent
- Pressure Drop Calculation in ANSYS Fluent.
- Comparison between Rough flow and smooth flow in ANSYS fluent.
- CFD Result analysis in ANSYS fluent.
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#ansys # ansystutorials #roughness # ansysfluent
This is one of the best tutorials I have found online...Thanks a lot..
Thank you:)))
Such a good information about turbulent , nice work sir 😀😀😀👍👍👍👍
Thank You:))
Best tutoria, thank you.
You are most welcome.
Sir, I have some question like .... how we will conclude that our mesh is good like I usually noticed that after doing mesh you zoom it and confirm that it's quality good or not? please make a lecture on it, with examples. we love to hear your voice.
Also it would be great of you can make a video on cold plate with rectangular channels having some internal surface roughness
Ok, would try to make a tutorial on that.
Thank u so much sir,this really the best tutorials ,but sir can you make a video about who modeling the rough surface in journal bearing .
Regards,
For journal bearing simulation you should do the single moving reference frame along with roughness modeling on the journal wall.
Considero que usar el mismo mallado para tubo rugoso y tubo liso, no es correcto. Ya que el mallado depende de la rugosidad y condiciones del flujo. (Consider that using the same mesh for rough tube and smooth tube is not correct. Since the meshing depends on the roughness and flow conditions.)
Sir, where i can get the information of CD nozzle physics and parameters for cold spray surface coating simulation to analyze gas flow and particle flow inside the nozzle
Search for some research papers on this, probably on Researchgate.
Sir why did not specify outlet pressure is 0 in boundary conditions
Sir, I have a question. I do the same thing you did (except mesh element size, my mesh size is 0.0027) but it does not give me correct result. My experimental result is 1142 pa/m and with this model I get inlet as 2455.2612 pa and outlet as 1743.3233 pa and that gives me 711.9377 pa. My pipe is 1m long and that gives me 711.9377 pa/m as a pressure gradient. I changed the element size and do it again but results were not in a good agreement with the experimental results. What should I do, what am I doing wrong? I have to figure this out because it wiill be in my msc thesis :(
Have you done the Grid independence test?. Is the mesh good enough to capture the variations ?. Which turbulence model are you using?.
@@AnsysTutor yes I did but even with the 0,0014 mesh size I get 732.958. I'm using k-epsilon model with standard wall functions. In the post-precces part I find inlet pressure as 901.23, is it the right one? It looks more acceptable because it gives 901.23 pa/m as the atmospheric pressure is zero. And it is good to mention that y+ is 67.720144.
It is very informative video on incorporating surface roughness for heat transfer analysis.I would like to ask whether the roughness is only inside the pipe wall?Please shed some light.Thanks
Yes, correct, it's only inside of the pipe where the adjacent zone is fluid region.
Best tutorial!!!
How can i use water liquid and water vapour(two phase) at same pipe?For this turbulent flow and calculation pressure drop.Can u help me please?
You need to select multiphase model for this, and in boundary conditions-> inlet you need to put the volume fraction of each fluid entering into the pipe.
@@AnsysTutor Sir,can you make a video for this situation?I can't calculate the volume fraction of each fluid.
sir one more thing to ask how to conclude that which solver type we have to select like in this case you selected pressure-based and velocity formation is absolute. how you chose and what are the criteria to do so?
so means that smooth surface have better flow right? with lower pressure drop.but how about the dimple in air intake manifold. is it like increse the roughness too?. but based on my research dimple is better than smooth surface in the intake.
I have a question?
Is the roughness implemented over the whole wall boundary?
In general experiments the roughness is introduced at a certain region. How do we introduce roughness over a certain region only?
In that case, you can split the walls and put roughness to the selected wall surface only.
@@AnsysTutor okay thanks. I have another query. I am working on an airfoil, and i want to implement the roughness at a particular point on the airfoil. Let's say at 10% of the chord only. Can you guide me how to do this?
You can use the imprint faces option to create only that 10% face. ruclips.net/video/4xEJRfKkCbU/видео.html
Hi,
I have a problem in modeling a double tube heat exchanger. If I run the simulation with zero roughness, temperature keeps near expected values, but pressure drop is too low. If I increase de roughness, pressure drop goes up near expected values, but out let temperature goes down, which makes sense because more turbulence increases heat transfer, However, does heat transfer coefficient is far different from what I expected. I really do not know what else to do,I have tried different combinations of mesh. I am keeping orthogonal quality at around 0.74 and skweeness at around 0.25. Please, give me some light here. Thanks in advance
How many iterations are you running in each case.
@@AnsysTutor Hi, I have tried more than 500 and sometimes even 1000. The point is, I have got convergence for some runs. It is a 2 m long tube, including hot fluid domain, tube domain and cold fluid domain. To reduce time os simulation I have used to symmetry planes, so that I have only 1/4 of the geometry, and in most cases the mesh get more than 500.000 elements, which would be more than 2 million elements if I consider the whole geometry. Thanks
Try once with sweep mesh method with all hexahedral cells.
@@AnsysTutor i'll do that and see. I'll let you know the result as well. Thanks
Hello, very good instructions. Could you let me know how I can extract surface roughness of the real pipe (not only Ra value, the actual surface)? Is it even possible to do like that? TIA
As per my knowledge that is not possible in Ansys . To get the Ra value you need to test the specimen using the practical instuments.
Some how my Net pressure comes to 509pa ! help!
Do we have to put the roughness height in the ansys fleunt only? Should we follow similar procedure for rectangular microchannel?
Yes.
@@AnsysTutor please make videos on generating roughness in the outer peripheral of the microchannel.
Or guide me how we can do.
Can we generate random number and attach to surfaces in Ansys?
hello sir, may i know how have you calculated the roughness height as 0.0003m is there any calculation for it.
thank you.
We have just assumed the height without any calculations.
Hello, did you check the Y+ values for your model? How do you know that roughness correctly affects flow? Thank.
we have compared the pressure loss in both the cases, with the same mesh.
Ansys-Tutor I'm new to Ansys. Tell me which grid is better for me to build and how to take into account the roughness of 10 to 100 microns in modeling the air flow in the pipe? Thank.
sir can you make video for mixing fluid
we had already uploaded many videos of fluid mixing, please visit our channel page
Ok sir