Not sure why ... now you have to go with solution of UDS ... nUse Define_AdjustnLoop through all threads and cellsnSave the mass fraction into C_UDSI(c,t,i)nNow you can call the gradient from any other function using C_UDSI_G(c,t,i) ... this will have 2/3 components in x, y and z direction.nDon't forget to increase the number of user defined scalar and disable solving the equationn