Time and Spatial Converges of Model

garcijon · September 18, 2017, 10:42

Hi,

When running a model on comsol the log gives a count of time and spatial converges failure as I understand it (columns TFail, NLFail). If there are many failures but the model still converges does that mean that the result is unreliable?

Thanks

piu58 · September 18, 2017, 12:59

> still converges does that mean that the result is unreliable?

Not necessary. It may be that the stationary solution is quite correct. The transient solution should be take with a grain of salt.

FMDenaro · September 18, 2017, 13:09

In any CFD model the convergence of a solution does not ensure automatically that is also physically realiable...

September 18, 2017, 10:42	Time and Spatial Converges of Model	#1
garcijon New Member Jon Join Date: Mar 2017 Posts: 3 Rep Power: 9	Hi, When running a model on comsol the log gives a count of time and spatial converges failure as I understand it (columns TFail, NLFail). If there are many failures but the model still converges does that mean that the result is unreliable? Thanks

September 18, 2017, 12:59		#2
piu58 Senior Member Uwe Pilz Join Date: Feb 2017 Location: Leipzig, Germany Posts: 744 Rep Power: 15	> still converges does that mean that the result is unreliable? Not necessary. It may be that the stationary solution is quite correct. The transient solution should be take with a grain of salt. __________________ Uwe Pilz -- Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950)

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September 18, 2017, 13:09		#3
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,897 Rep Power: 73	In any CFD model the convergence of a solution does not ensure automatically that is also physically realiable...