Hi

My model has a free surface (liquid-gas interface). There are heat transfer between liquid and gas volumes. Fluent is creating shadow wall at free surface. I have to set marangoni stress at free surface boundary condition but have not to shadow wall ( if I set marangoni stress to shadow wall, solution is wrong). Free surface velocity is very important for model, but after solution, free surface velocity profile and shadow wall velocity profile is different. but this two velocity profiles must have same values.

How can I solve this problem? can I use UDF to equal them (shadow wall velocity=free surface velocity) how can I write this codes?

thanks

Please Help