Multiphase flow through a porous medium

[william Alex]

I am simulating flow through porous medium with VOF method and species transport. For phase change i have Lee Model, and i have no idea about the evaporation frequency and condensation frequency
Second I am using the evaporation frequency as 30. The liquid is n-heptane while for vapour phase i have 25 species and 34 reaction.
I am getting results but the temperature is very lower and second my flame is away from the porous medium

 

[boneh3ad]

I suspect that this is such a hyperfocused question that the odds of anyone here being familiar with the topic are fairly slim.

 

[william Alex]

I suspect that this is such a hyperfocused question that the odds of anyone here being familiar with the topic are fairly slim.

Sir Let me explain.
I have a capillary tube with ID 0.2 mm. At inlet i give mass flux with liquid phase. At the exit of the capillary tube i define a region where i patch temperature. I am getting divergence error in pressure coupling etc.
My Solver setting as follow
VOF
Steady
Surface Tension
Species Transport Volumetric
Simple
URF are 0.2 to 0.3

 

[bigfooted]

what solver are you using? If it is from ANSYS you can contact them through the customer portal and ask their advice.

Just getting a solution for a single phase heptane flame will be a challenge, let alone simulating it together with the entire evaporation of the fuel in a porous medium. These multiphysics problems are usually spatially separated. Do you really need to simulate them inside a single simulation? Have you tried simulating only the heptane flame? Even for a skeleton mechanism like the one you are using, such a simulation can take quite some time.

 

[william Alex]

what solver are you using? If it is from ANSYS you can contact them through the customer portal and ask their advice.

Well thanks for reply.
I am using VOF with two phase. The primary phase is my mixture imported from chemkin while my secondary phase is heptane liquid. for mass thransfer mechanism i am using lee model, but evaporation frequency is confusing term. I really appreciate your help.