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Flow 3D Cast simulation Error: Fluid volume error exceeds 5%

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Old   August 1, 2017, 13:03
Default Flow 3D Cast simulation Error: Fluid volume error exceeds 5%
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Santosh Reddy
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In many of my simulations in Flow 3D Cast, I am observing following error and mentor tip but I have no idea how to implement the suggested changes. Any kind of help to solve this issue is appreciated.

convective flux exceeded stability limit at t= 5.0192E-03 cycle= 26 iter= 17 delt= 2.7720E-04 mesh block 1
restarting cycle with smaller time step
3.02227E-02 163 2.32E-04 2.32E-04/cz 6 4.57E-01 5.9800E-06 +1.83E-01 0.02 0.0000E+00 0.00 00:00:07 94 11:57:45 00:08:04
6.04859E-02 277 3.29E-04 3.29E-04/cz 4 5.67E-01 1.1609E-05 +2.11E+00 0.03 0.0000E+00 0.00 00:00:10 87 11:57:48 00:06:08
9.05542E-02 368 3.53E-04 3.53E-04/cz 9 7.92E-01 1.6953E-05 +4.40E+00 0.04 0.0000E+00 0.00 00:00:13 90 11:57:51 00:05:33


============= mentor tip ===============
fluid volume error exceeds 5%.
1. tighten convergence epsadj.
2. reduce time-step size tdtmax.
3. reduce rcsql compressibility.
4. is there excessive fluid break up?
========================================


TIA
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Old   November 30, 2018, 03:41
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Alex
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The same problem-_-||

Have you solved it yet?
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Old   December 13, 2018, 12:58
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thunde47
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Well, try doing what the mentor tip recommends. You can change the epsadj parameter in the numerics tab under the convergence controls for pressure solver options. epsadj corresponds to the multiplier for dynamically adjusted convergence criterion.
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