Climbing inlet pressure with simpleFoam and directMappedPatches
 

Hello,

I've been racking my brain trying to figure this one out and its stumped me. I'm using a really complicated 3d Mesh over the domain below:

https://dl-web.dropbox.com/get/Publi...png?w=392bfba0

and it has been decomposed in scotch like so:

http://dl.dropbox.com/u/35794017/pro...stribution.png

All works fine (no errors) with simpeFoam and directMapped patches and I get convergence plots looking like

http://dl.dropbox.com/u/35794017/convergeBetter.png

I'm monitoring point values around the domain in various locations and everything just keeps increasing linearly. Nothing seems to be topping off and evening out. On courser meshes, I do get some flattening of values...but im interested in the fine mesh. I am looking at changing my pRefCell to someplace different...but Im not sure if that will help. I also tried to use cyclic boundary conditions and make a simpleChannelFoam hybrid of channelFoam and simpleFoam with no luck on convergence (in the channel solver, i get pretty crazy gradP within 10 iterations). Any thoughts? Could it be my discretization using linearUpwind? Sorry for the large pictures in the post. Patch summary is :

figured out a solution to my problem
 

Just thought I would provide an answer in case anyone else is looking for an answer. I ended up using an inletOutlet condition for velocity at the exit with

and I used a fixedMeanValue boundary condition for pressure that can be found at (http://www.cfd-online.com/Forums/ope...condition.html). The condition can be used with

using this with limited schemes and celllimited gradient schemes on a polyhedral mesh....the rise in pressure eventually leveled out. I monitored the pressure drop between the inlet and outlet and once that was constant, 10 probe points were constant, and the residuals dropped to a level lower than 1e-4 it was an acceptable answer.