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June 23, 2016, 11:30 |
Divergence in non-Newtonian fluid UDF
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New Member
mohsen
Join Date: Jun 2015
Posts: 25
Rep Power: 11 |
Hi
I have written an UDF for a non-Newtonian fluid. first, i run the project with steady and constant viscosity for 10 iteration and after that i hooked the UDF but i faced with this divergence error: # Divergence detected in AMG solver: epsilon -> Increasing relaxation sweeps! # You may try the enhanced divergence recovery with (rpsetvar 'amg/protective-enhanced? #t) turbulent viscosity limited to viscosity ratio of 1.000000e+20 in 249582 cells reversed flow in 1614 faces on pressure-outlet 13. Divergence detected in AMG solver: epsilon Divergence detected in AMG solver: epsilon Divergence detected in AMG solver: epsilon Divergence detected in AMG solver: epsilon Divergence detected in AMG solver: epsilon Error at host: floating point exception Error at Node 0: floating point exception Error at Node 1: floating point exception Error at Node 2: floating point exception Error at Node 3: floating point exception Error at Node 4: floating point exception Error: floating point exception Error Object: #f UDF is: #include "udf.h" DEFINE_PROPERTY(cell_viscosity,c,t) { #if !RP_NODE real SR=C_STRAIN_RATE_MAG(c,t); real n=0.70; real k=0.00103; real PV=0.0001; real YP=2.8728; real YSR=0.018; real EV; real SS; SS=k*exp(n*log(SR)); EV=(SS/SR)+k*(exp((1-n)*log(SR/YSR))); return EV; #endif } now, what should i do for fix that ERROR. it's my pleasure if somebody could help me. thanks BEST REGARDS |
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