UDF to specify a dynamic inteface in VOF
 

Hi, I am using vof model with 2 phases .. my problem is writing a UDF which specify the displacement of the interface the two phases with time and/or space (say as a sinusoidal or gaussian varaition law of the Free interface between the 2 phase ...

when I try to use the C-VOF with this law , and introduce time ans spacial coordinates..I have error message..(Access violation..) did someone has deal with similar problem ... any suggession ... thanks in advance