The k-w model and it's wall interaction is covered in the Theory Guide, as you're using an rpsetvar, that's found in the Fluent help. Compare how k-w works with the various flavours of k-e model and their wall functions. As the rpsetvar command is unlikely to be documented I suspect it does something odd I'd suggest leaving it alone. It's also outside the scope of support on here. From experience I recommend leaving commands like that alone: there's a reason we don't advertise them!

Hi Rob, Thank you for your response. n