# Comparing compressible tutorial logs, biconic vs forwardStep

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 November 14, 2010, 13:25 Comparing compressible tutorial logs, biconic vs forwardStep #1 New Member   Chris Craighill Join Date: Nov 2010 Posts: 1 Rep Power: 0 Using the rhoCentralFoam solver, the biconic25-55Run35 tutorial automatically logs rho and U information upon running, like so: Code: ```Mean and max Courant Numbers = 0.0012920864784495 0.497600587795793 deltaT = 3.89459662217963e-10 Time = 9.96105e-08 diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 diagonal: Solving for rhoUx, Initial residual = 0, Final residual = 0, No Iterations 0 diagonal: Solving for rhoUy, Initial residual = 0, Final residual = 0, No Iterations 0 diagonal: Solving for rhoUz, Initial residual = 0, Final residual = 0, No Iterations 0 smoothSolver: Solving for Ux, Initial residual = 9.75670512743737e-07, Final residual = 9.54800213661884e-12, No Iterations 2 smoothSolver: Solving for Uy, Initial residual = 1.2348036560941e-06, Final residual = 2.57085765664881e-11, No Iterations 2 smoothSolver: Solving for Uz, Initial residual = 4.89968196783422e-05, Final residual = 2.09454806915165e-12, No Iterations 2 diagonal: Solving for rhoE, Initial residual = 0, Final residual = 0, No Iterations 0 smoothSolver: Solving for e, Initial residual = 1.2461515340186e-06, Final residual = 1.77372326022229e-10, No Iterations 2 ExecutionTime = 67.57 s ClockTime = 67 s``` Whereas the rhoCentralFoam forwardStep tutorial logs only rho, as follows: Code: ```Mean and max Courant Numbers = 0.0531236 0.19895 deltaT = 0.000392614 Time = 1.36427 diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 diagonal: Solving for rhoUx, Initial residual = 0, Final residual = 0, No Iterations 0 diagonal: Solving for rhoUy, Initial residual = 0, Final residual = 0, No Iterations 0 diagonal: Solving for rhoE, Initial residual = 0, Final residual = 0, No Iterations 0 ExecutionTime = 81.9 s ClockTime = 82 s``` Since I'm running into errors with my own rhoCentralFoam simulations (using a modified forwardStep tutorial setup), I'm interested in seeing how U is behaving, but obviously it doesn't show up. At first I compared the input files for both tutorials in /constant, /system and /0, but found no clear reasons there, so now I've gone searching through the source code but haven't yet found anything there either. I'm sure I'm missing something obvious. Can anyone tell me why rhoCentralFoam prints U messages for one case and not the other?

 May 1, 2011, 10:34 #2 Super Moderator   Praveen. C Join Date: Mar 2009 Location: Bangalore Posts: 342 Blog Entries: 6 Rep Power: 17 The first one is a viscous case while the second one is inviscid.