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Unable to validate Drag coefficient for Flow past a sphere using OpenFOAM |
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#1 |
New Member
Jayabrata Dhar
Join Date: Nov 2018
Posts: 17
Rep Power: 7 ![]() |
Hi Foamers,
I am new to pimpleFoam / OpenFOAM and was trying to validate the overall drag on a sphere due to a flow past it. I am aware of a thread closely related: Drag coefficient of sphere & spherical bubble at Re = 1. There are other threads too but none speaks of validation at low Reynolds number (creeping) flows with Cd=24/Re. I have followed the above link to build my case. I used the entries as stated in the link with the given geometry, I am not getting the drag coefficient of 27.6, I am getting something around 40. I have attached my case, it would be helpful if anyone could spot where I am going wrong or share any comment that would help me validate the same. Additionally, is there a 3D version for validating Cd for flow past a sphere in OpenFOAM? PS: To run the case, one has to convert the .geo file in constant to .msh using GMSH and then use the two following commands: Code:
gmshToFoam constant/sphere.msh pimpleFoam Thanks in anticipation, JD Last edited by jd87; January 30, 2024 at 13:53. Reason: Forgot to attach the file, here it is |
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#2 |
New Member
KANISHKA AWASTHI
Join Date: Jan 2024
Posts: 2
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Hello jd87,
Just wanted to ask if you tried getting the drag force from paraview and then tried calculating Cd from there? Regards |
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#3 | |
New Member
Jayabrata Dhar
Join Date: Nov 2018
Posts: 17
Rep Power: 7 ![]() |
Quote:
I have used the forcesCoeff utility (you may find that in the controlDict file). I tried previously with paraView, but I did not get the desired results, hence attempted to use the internal OpenFOAM utility. Let me know if you have any ideas regarding this problem. Thanks, JD |
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#4 |
New Member
KANISHKA AWASTHI
Join Date: Jan 2024
Posts: 2
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hello,
Sure, if i'm able to find anything on this, i'll let you know... regards |
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#5 |
New Member
Jayabrata Dhar
Join Date: Nov 2018
Posts: 17
Rep Power: 7 ![]() |
The problem is solved and the files are attached for future help. The file is checked to run on OF v8 and v10.
Best, |
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Tags |
drag coeffcients, flow past sphere, pimplefoam, validation |
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