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Prescribed compression of fluid
Posted May 27, 2016, 6:04 a.m. EDT Fluid & Heat Version 5.1 3 Replies
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Hi,
I have a very simple model, consisting of a 1 x 1 m^2 square which is filled with Air.
I know that this problem can be solved by assuming ideal gas, and computing the area of the deformed domain. However, I want to combine this concept with more complex fluids, and therefor I want the Laminar Flow physics to solve this problem.
The study is Time Dependent.
I use the Deformed Geometry module to prescribe the deformation of my domain:
Attach Free Deformation to the whole domain, and apply a Prescribed Mesh Velocity to the top boundary, with prescribed y velocity of -0.05 m/s. The other boundaries are fixed (prescribed displacement of (0,0)).
It then fails: "Repeated error test failures. May have reached a singularity." when I try to run it.
Also, I see that the two sides of the square keep there height, but they have to shrink with the lowering of the top boundary.
I have a very simple model, consisting of a 1 x 1 m^2 square which is filled with Air.
I know that this problem can be solved by assuming ideal gas, and computing the area of the deformed domain. However, I want to combine this concept with more complex fluids, and therefor I want the Laminar Flow physics to solve this problem.
The study is Time Dependent.
I use the Deformed Geometry module to prescribe the deformation of my domain:
Attach Free Deformation to the whole domain, and apply a Prescribed Mesh Velocity to the top boundary, with prescribed y velocity of -0.05 m/s. The other boundaries are fixed (prescribed displacement of (0,0)).
It then fails: "Repeated error test failures. May have reached a singularity." when I try to run it.
Also, I see that the two sides of the square keep there height, but they have to shrink with the lowering of the top boundary.
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3 Replies Last Post Mar 4, 2017, 2:18 p.m. EST
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Posted:
9 years ago
I see I made a stupid mistake regarding the shrinking of the sides. I have solved that by prescribing the mesh displacements on the sides only in x-direction.
Now it compresses as I want to do it, but the pressure is not changed.
Now it compresses as I want to do it, but the pressure is not changed.
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Posted:
9 years ago
Dear Jort,
I suggest you adrress your post directly to: support@comsol.com
Best regards,
François Mandias
I suggest you adrress your post directly to: support@comsol.com
Best regards,
François Mandias
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Posted:
8 years ago
Hi, Jort Jacobs,
Have you solved the problem? I also encountered a similar situation. Could you please give me some suggestions to achieve the compression at a constant rate?
Thank you so much for your help.
Yu
Have you solved the problem? I also encountered a similar situation. Could you please give me some suggestions to achieve the compression at a constant rate?
Thank you so much for your help.
Yu