[mihaipruna]

what do the equation relaxation factors do. I noticed if I set any equation under relaxation factor to under 0.9 in rhoSimplecFoam I get a floating point error during the first time step.
For instance, the values below do work but anything lower in equation under-relaxation factors will cause a crash when calculating h.

relaxationFactors

{

fields

{

p 0.30000;

rho 0.3000;
U 0.3;

}

equations

{

U 0.90000;

h 0.90000;

k 0.90000;

omega 0.90000;

}

}

[hcl734]

Under-relaxation works by limiting the amount which a variable changes from one iteration to the next, either by modifying the solution matrix and source prior to solving for a field or by modifying the field directly.

http://cfd.direct/openfoam/user-guide/fvsolution/