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Error in Reading Velocity at each time step while using TimeVarryingMappedFixedValue |
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September 29, 2018, 22:13 |
Error in Reading Velocity at each time step while using TimeVarryingMappedFixedValue
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#1 | ||
New Member
Faiaz Khaled
Join Date: Oct 2017
Location: United States of America
Posts: 17
Rep Power: 9 |
Hello Everyone,
I am relatively new to Openfoam. I am trying to simulate wind flow having turbulent velocity with logarithmic velocity profile close to the ground. for that purpose I am using timevarryingmappedFixedvalue at the inlet boundary condition for U. I also have the necessary velocity folders for each time step inside the inlet folder under boundarydata folder inside Constant. I was able to run a case for a smaller empty domain for upto 5 seconds. But, when I increase the time step and run it for a longer period (say like 30s) the solver blows up. I am sharing the control dictionary and the error I am getting in this thread. Please help me on this. I am just curious whether there something wrong with the mesh or not. Please note that this is just an empty domain. I am trying to get the correct velocity profile and turbulence intensity. Quote:
Quote:
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September 30, 2018, 00:54 |
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#2 |
Member
Vivek
Join Date: Mar 2018
Location: India
Posts: 54
Rep Power: 8 |
Hi Faiaz Khaled,
Your error is due to k(turbulent kinetic energy) .if you the error message ,the residuals of k are going upto 10^32..this may be one of reason for code blow up. Change your boundary conditions ok k file. And another thing you can modify is solver used for k in fvSolution Thanks, Vivek |
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October 1, 2018, 15:55 |
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#3 | |
Super Moderator
Tobias Holzmann
Join Date: Oct 2010
Location: Bad Wörishofen
Posts: 2,711
Blog Entries: 6
Rep Power: 52 |
Hi all,
as it was pointed out by Vivek, it seems that you have problems in your k-equation. Quote:
Just a correction, it is not the residual value of k, it is the real cell values that are getting crazy.
__________________
Keep foaming, Tobias Holzmann Last edited by Tobi; October 2, 2018 at 06:59. |
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October 1, 2018, 16:04 |
Thank you
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#4 |
New Member
Faiaz Khaled
Join Date: Oct 2017
Location: United States of America
Posts: 17
Rep Power: 9 |
Dear Mr. Vivek and Dr. Tobi,
Thank you very much. I will keep working on it and follow your suggestions. I will get back to you people soon. Thank you once again. Regards, Faiaz |
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