Hello,

I'm having a problem when using a 2nd order scheme with enhanced wall treatment. The soultion deiverges until it crashes completely every time.

Has anyone experienced this before?

Any help is very much appreciated.

Thanks

Hi

What is the y+ for the first near-wall grid? Are you trying to model natual convection?

I'm unsure what the y+ value is but it looked reasonable.

Not natural convection but a gas turbine combustor model. I get this problem even when using only a turbulence model(no heat transfer). Every time I switch on enhanced wall treatment it diverges, with 2nd order sol.

Thanks

What turbulence model are you using?

What, precisely, is your typical yplus value? What is your mesh inflation factor near the wall?

Joe (and others),

I cant access my case file just now to get the y+ value but I'll get it asap.

I'm using the RSM because it is required for swirling flow. I need this more than enhanced wall treatment.

By inflation factor to you mean how much the density increases as I move away from the wall? The growth is 1.1 for 6 rows then it goes to a normal mesh.

When I put on enhanced wall treatment and only calculate the turbulence, the nturbulent viscosity is limited in cells but it eventually irons out and starts to converge. As soon as I solve all equations it crashes again. This has occured with various different grids for the same geometry.

As soon as I go into work I'll check the y+ value for 2nd order without EWT, but my laptop is currently in PC World being repaired.

Thanks very much

Phil