surface tension as function of normal gradient
I am looking to use a UDF to assign surface tension as a function of the normal gradient of a user defined scalar at a transient fluid-gas interface. I am having difficulty identifying the normal gradient at the interface. Does anyone know how to identify the normal gradient of a scalar at an interface in VOF? Also, when you hook a UDF for surface tension, does Fluent automatically locate the interface and apply it there?
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