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October 23, 2018, 10:44
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LES simulation
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#1 |
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New Member
Yuan Jiahui
Join Date: Oct 2018
Posts: 9
Rep Power: 8  |
Hi everyone,
I have used k-epsilon model to calcaulate the case (in the attachment) and the result agrees well with the experiment data. Now I am trying to use LES model calculate the case again and compare the result of LES with result of k-epsilon. Known conditions are velocity field at inlet is (0.455 0 0) and turbulent intensity is 0.04. I choosed pisoFoam as a solver and dynamicKEqn model referring to pitzDaily in tutorials. Now I encounter severals 1. How to determine the initial value of k in 0 file? Is there any empirical fomula to get k like RANS? 2. When I choose different deltT in controlDict, the result show great difference.Why? Any advice is welcome. |
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October 23, 2018, 11:54
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#2 | |
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Member
ssa
Join Date: Sep 2018
Posts: 93
Rep Power: 8 |
Quote:
Try to use pimpleFoam with adjustTimestep on and maxco 1. This will automatically calculate the deltaT based on the courant number. |
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October 24, 2018, 09:04
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#3 |
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Senior Member
Michael Alletto
Join Date: Jun 2018
Location: Bremen
Posts: 616
Rep Power: 16 |
Can you provide maybe some figures of the results in oder that it is easier to help?
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| Tags |
| boundary condition, les |
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