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

SanSam · August 1, 2017, 13:03

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

EternalEnvy · November 30, 2018, 03:41

The same problem-_-||

Have you solved it yet?

thunde47 · December 13, 2018, 12:58

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.

August 1, 2017, 13:03	Flow 3D Cast simulation Error: Fluid volume error exceeds 5%	#1
SanSam New Member Santosh Reddy Join Date: Feb 2017 Posts: 4 Rep Power: 9	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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November 30, 2018, 03:41		#2
EternalEnvy New Member Alex Join Date: Dec 2017 Posts: 13 Rep Power: 8	The same problem-_-\|\| Have you solved it yet?

December 13, 2018, 12:58		#3
thunde47 Senior Member thunde47 Join Date: Dec 2015 Location: India, USA Posts: 133 Blog Entries: 1 Rep Power: 10	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.