Yes, after reading this post Convect( ) in parallel - #2 by prj. I know that using ‘convect’ inside a ‘varf’ will generate wrong results for high timesteps. But it seems work at small time step as this post Convect( ) in parallel - #6 by mojtaba.barzegari shows. Anyway, I will change ‘convect’ in ‘varf’ with ‘convectParallel’ to see what will happen.
Many thanks for your reply.