I wish to define a diffusive, conductive coupled system of pdes in cfx for simulation. Is it possible to define an expression which would formulate a problem similar to:

u_t= u_xx + u_yy + u_x + u_y - u*v v_t= v_xx + v_yy + v_x + v_y - u*v

Would anyone know the syntax for the expression?

Thanks.

Sorry equations should read:

u_t= u_xx + u_yy + u_x + u_y - u*v

and

v_t= v_xx + v_yy + v_x + v_y - u*v

[ali1367hb]

I have the same problem in defining an expression with some partial derivatives including derivative of velocity with respect to lenght x.
please help me on this.