Topics

31

Fluent / How do I get contour plot of D32 (Sauter Mean diameter) over a plane in Fluent

« on: February 04, 2012, 05:49:36 PM »

Hello,

I want to plot contours of D32 (sauter mean diameter) in Fluent? I am modelling spray simulation.

Thank you.

32

Fluent / Turbulent viscosity limited to viscosity ratio of .... in Fluent

« on: February 04, 2012, 04:36:32 PM »

Hi,

How to resolve the warning message saying that the turbulent viscosity limited to viscosity ratio of 1e5 in 34 cells?

Help.

33

Fluent / I am getting divergence on the first iteration for an axisymmetric problem?

« on: February 04, 2012, 04:21:53 PM »

I am running a 2d axisymmetric simulation but it diverges on the first iteration with the following message:

Divergence detected in AMG solver: x-momentum -> Increasing relaxation sweeps!

Error: Divergence detected in AMG solver: x-momentum
Error Object: #f

Help me please.

34

Fluent / DPM concentration in a cell using Fluent UDF

« on: February 02, 2012, 04:11:18 PM »

Hi,

I am working on modelling of heat transfer from the discrete phase (lagrangian) to the continuous phase. I need to find out the concentration of the discrete phase in the cells. Based on the concentration, I can modify the equation used for heat transfer between the two phases. Because when the particles are moving very close to each other, the effective heat transfer coefficient will be very different from the heat transfer coefficient of a single particle.

Could any one here also tell me about the literature in dealing with heat transfer from spherical particles that are closely spaced?

Thank you.

35

Fluent / How many particle tracks do I need for discrete particle tracking in CFD?

« on: January 27, 2012, 09:45:53 AM »

Hi,

I am a beginner in multiphase simulation using Lagrangian approach. How do I know how many particles do I need to have a representative particle trajectory in the simulation? Does it depend on the mass flow of the particles? Does each particle represent its own mass of single particle or is it the total mass flow of the particles divided by the number of particle tracks?

Please help.

Many thanks.