error epsilon too small
Hi
I simulated a cyclone in fluent.now I'm tracking particle in unsteady method. when fluent go to dpm tracing, print "epsilon too small epsilon too small..." can any body help me??? |
I just had the same problem.
For me it is in steady-state, laminar flow (so no k-epsilon model used). I have tried changing the tolerance in the accuracy control of the dpm model, but the same error message keeps coming up. The solution in my case: I looked at the injection file that I used, and I found out that I made a mistake before, and had given the particles an initial velocity of 1e22 m/s. After fixing that mistake, the particles started with a more realistic velocity, and the "epsilon too small" error disappeared. |
Hi guys,
I am experiencing the same problem, it is also a laminar flow so I don't really understand what it is referring to epsilon (do someone know?). I reviewed my BCs and nothing seem to be wrong. The particles are accelerated by a volumetric force given by an UDF, maybe this can be the source of the problem, I am testing it. Any hint or idea is welcomed. Thanks in advance |
Hi~
The same error appeared when using DPM and LES. It said: " DPM Iteration .... epsilon too small Internal error at line 16140 in file '..\..\src\dpm_path.c' on Node 1. epsilon too small Internal error at line 16140 in file '..\..\src\dpm_path.c' on Node 0. epsilon too small Internal error at line 16140 in file '..\..\src\dpm_path.c' on Node 1. epsilon too small Internal error at line 16140 in file '..\..\src\dpm_path.c' on Node 2. number tracked = 1, escaped = 0, aborted = 0, trapped = 0, evaporated = 0, incomplete = 0, incomplete_parallel = 0 Parallel particle tracking concurrency: 33% " I think that if the error is related to dpm path? and another question is: what is the meaning of "Parallel particle tracking concurrency: 33%" ? Can anyone kindly help? Thank you! |
try to increase the turbulent dissipation rate in under-relaxation factor
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