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Showing results 1 to 5 of 5 Search took 0.00 seconds. Search: Posts Made By: FMDenaro

Forum: Main CFD Forum April 29, 2016, 17:50

Replies: 16 How to fix / solve local instability Views: 1,015 Posted By FMDenaro your problem is in the outflow BC.s, the... your problem is in the outflow BC.s, the dissipation term is used in cell-centred colocation to avoid pressure decoupling... Check the BC for the pressure problem

Forum: Main CFD Forum April 29, 2016, 10:47

Replies: 16 How to fix / solve local instability Views: 1,015 Posted By FMDenaro are you solving a Poisson pressure equation?... are you solving a Poisson pressure equation? check if the continuity constraint is satisfied by using your discretized BC.s. It is just sufficient check in a single time step what happen at the...

Forum: Main CFD Forum April 29, 2016, 10:27

Replies: 16 How to fix / solve local instability Views: 1,015 Posted By FMDenaro Numerical instability is a process that during... Numerical instability is a process that during the time integration drive the solution to blow-up, wiggle is a finite numerical (and unphysical) oscillation in the solution eve in the steady state. ...

Forum: Main CFD Forum April 29, 2016, 07:50

Replies: 16 How to fix / solve local instability Views: 1,015 Posted By FMDenaro thus, this is not a numerical instability but a... thus, this is not a numerical instability but a wiggle in the steady solution... check in which variables (those resolved in the code) you see such oscillations

Forum: Main CFD Forum April 29, 2016, 03:13

Replies: 16 How to fix / solve local instability Views: 1,015 Posted By FMDenaro but running this solution for long time you get a... but running this solution for long time you get a numerical blow-up of the solution? Apparently it seems that something in the BC.c can be wrong... However, check for the CFL and viscous stability...

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