# Supersonic flow over a cylinder

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 June 1, 2018, 13:11 Supersonic flow over a cylinder #1 New Member   Vishish Behera Join Date: Jan 2017 Posts: 7 Rep Power: 9 I am simulating a supersonic laminar flow over a cylinder and this error has stalled me for a while/ I've already checked the other threads, and none of them worked so far. What can be the problem? Create mesh for time = 0 PIMPLE: no residual control data found. Calculations will employ 2 corrector loops Reading thermophysical properties Selecting thermodynamics package { type hePsiThermo; mixture pureMixture; transport const; thermo hConst; equationOfState perfectGas; specie specie; energy sensibleInternalEnergy; } Reading field U Reading/calculating face flux field phi Creating turbulence model Selecting turbulence model type laminar Creating field kinetic energy K No MRF models present No finite volume options present Starting time loop Time = 5e-07 Courant Number mean: 0.0597729 max: 1.37857 diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 PIMPLE: iteration 1 smoothSolver: Solving for Ux, Initial residual = 0.667594, Final residual = 0.239997, No Iterations 1000 smoothSolver: Solving for Uy, Initial residual = 0.999981, Final residual = 4.26033e-07, No Iterations 3 smoothSolver: Solving for e, Initial residual = 1, Final residual = 9.68353e-06, No Iterations 116 [0] #0 Foam::error:rintStack(Foam::Ostream&) at ??:? [0] #1 Foam::sigFpe::sigHandler(int) at ??:? [0] #2 ? in "/lib/x86_64-linux-gnu/libc.so.6" [0] #3 Foam::symGaussSeidelSmoother::smooth(Foam::word const&, Foam::Field&, Foam::lduMatrix const&, Foam::Field const&, Foam::FieldField const&, Foam::UPtrList const&, unsigned char, int) at ??:? [0] #4 Foam::symGaussSeidelSmoother::smooth(Foam::Field&, Foam::Field const&, unsigned char, int) const at ??:? [0] #5 Foam::smoothSolver::solve(Foam::Field&, Foam::Field const&, unsigned char) const at ??:? [0] #6 Foam::fvMatrix::solveSegregated(Foam::dict ionary const&) at ??:? [0] #7 Foam::fvMatrix::solve(Foam::dictionary const&) at ??:? [0] #8 Foam::fvMatrix::solve() at ??:? [0] #9 ? at ??:? [0] #10 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" [0] #11 ? at ??:?

 June 1, 2018, 15:04 #2 Senior Member   Join Date: Aug 2015 Posts: 494 Rep Power: 14 From the error output, you can see that Ux takes 1000 iterations and your CFL number is above 1. Decrease your initial timestep and max Co number as a first step to working out the problem. Caelan

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