Gradient of Volume fraction in UDF

Babar Sharfuddin

Hi, I need to calculate the Volume fraction gradient in my UDF. Added the following in my UDF allocate memory for storing the data in the UDF but while interpreting, it says "Scalar_Reconstruction: undeclared variable". Please help me.

{ Alloc_Storage_Vars(pDomain,SV_VOF_RG,SV_VOF_G,SV_N ULL); Scalar_Reconstruction(pDomain, SV_VOF,-1,SV_VOF_RG,NULL); Scalar_Derivatives(pDomain,SV_VOF,-1,SV_VOF_G,SV_VOF_RG, Vof_Deriv_Accumulate); }