Boundary mass at the wall
 

Hi to all!!

1. Cw is the concentration at the wall boundary. This value is calculated along the area normal vector n.

2. A is a constant value and is equal to (V-K)/D, where V=0.000004 cm/sec, K=0.00000002 cm/sec and D=0.00000005 cm^2/sec.

3. I know the concentration C along all different directions x, y, z and n from former iterations. From all these values i want those who satisfy the normal gradient to the boundary.

4. The equation is Cw = ((V-K)/D) * dC/dn.

Thank you a lot!!!