Non-newtonian fluid viscosity-HB model

ywan168 · June 15, 2018, 18:14

Hello,

I am writing here to ask someone if he or she ever faced this kind of problem, When I simulate a fluid displaces another fluid, actually a fluid with constant viscosity displaces another non-newtonain fluid. When I set both fluids having constant viscosity, the solver can work but didn't calculate the right velocity. When I set the second phase as non-newtonain model (HB model), the solver didn't run, giving floating point exception error. (I use VOF, energy, and realizable k-e, enhanced wall Fn)

Anyone can explain this?

RaiderDoctor · June 16, 2018, 15:14

I don't think we have enough info to begin troubleshooting this problem. Could you include an image of your setup and mesh.

A floating point excetpion could mean a variety of things. When you look at your residuals, are they diverging?

ywan168 · June 21, 2018, 16:48

Quote:

Originally Posted by RaiderDoctor

I don't think we have enough info to begin troubleshooting this problem. Could you include an image of your setup and mesh.

A floating point excetpion could mean a variety of things. When you look at your residuals, are they diverging?

Hi, it's not diverging now when I change my outlet condition to mass flow out. Now it's computing but the velocity flowing up from bottom is not calculated right.

RaiderDoctor · June 22, 2018, 11:27

I'm sorry, but I don't have enough info on your problem to really understand what's going on. Again, could you post a picture of your mesh, and tell me a little about your setup?

June 15, 2018, 18:14	Non-newtonian fluid viscosity-HB model	#1
ywan168 Member Join Date: Nov 2016 Posts: 34 Rep Power: 10	Hello, I am writing here to ask someone if he or she ever faced this kind of problem, When I simulate a fluid displaces another fluid, actually a fluid with constant viscosity displaces another non-newtonain fluid. When I set both fluids having constant viscosity, the solver can work but didn't calculate the right velocity. When I set the second phase as non-newtonain model (HB model), the solver didn't run, giving floating point exception error. (I use VOF, energy, and realizable k-e, enhanced wall Fn) Anyone can explain this?

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June 16, 2018, 15:14		#2
RaiderDoctor Senior Member Join Date: Dec 2016 Posts: 152 Rep Power: 10	I don't think we have enough info to begin troubleshooting this problem. Could you include an image of your setup and mesh. A floating point excetpion could mean a variety of things. When you look at your residuals, are they diverging?

June 22, 2018, 11:27		#4
RaiderDoctor Senior Member Join Date: Dec 2016 Posts: 152 Rep Power: 10	I'm sorry, but I don't have enough info on your problem to really understand what's going on. Again, could you post a picture of your mesh, and tell me a little about your setup?