Learning Forum

[kuuku.botchway]

Hi everyone, I'm currently running a multiphase VOF problem with three phases, implicit formulation for volume fraction parameter, implicit body force activated, a polynomial function for the surface tension coefficient for each of the phase pairs with surface tension modeling turned on.  For the flow a k-epsilon viscous model is used with enhanced wall treatment, thermal effects and  curvature correction activated.  For one of the fluids I have a polynomial function with temperature as the variable.  I've been running into an issue where I'm receiving a floating point exception around when the fluid gets converted into the other fluid T=

This is the console message I received before the floating point exception.  Any assistance would be very helpful

[Amine Ben Hadj Ali]

Okay: first start simple and use a plain SST turbulence model (without any additional sub-models). Use a constant surface tension and try again. You need to find out the reason for this behavior: it actually starts diverging at the beginning of the time step. 

Can you  describe bit more the problem you are trying to model?

[kuuku.botchway]

Hi, soo after further troubleshooting it seens ti be a problem with Enhanced Wall Treatment in the K-Epsilon model.  Would you have any insight as to why that is?

[kuuku.botchway]

Hi, Thanks for the reply.  Soo I've attempted to run the simulation with a constant surface tension previously and received the same error.  I recently just attempted the k-epsilon model without any additional options (no enhanced wall treamtmant and thermal effect) and a constance surface tension now the issue seems to have gone away, but I'm not getting the results I needed.  I'm currently testing if the material I'm using is causing the issue

[pv00170]

I got the same problem "floating point" and it was due to inflation.

When I removed inflation, no floating point appeared.

[pv00170]

Also, if I used inflation I reduced the time step and now is working