This page describes techniques used to diagnose the cause of convergence problems encountered with the Diablo flow solver.
Visualize The Problem Area in the Flow Solution
If a flow solution fails because the flow solver is producing non-physical quantities such as negative density or pressure, the following error message is usually found in the "results.solv" output file:
Density or Pressure Problem: trying damping factor = 0.015
In this case, it can be useful to visualize the area of the flow solution where the non-physical quantity appears with visualization software such as Tecplot. Below are instructions on how to do this with Tecplot:
Download diverged flow solution and grid files to local computer with Tecplot
Run CFD lab script "gen_surfsym_layout" to show grid and solution on geometry only
Use Tecplot to calculate Pressure from diverged flow solution data:
This page describes techniques used to diagnose the cause of convergence problems encountered with the Diablo flow solver.
Visualize The Problem Area in the Flow Solution
If a flow solution fails because the flow solver is producing non-physical quantities such as negative density or pressure, the following error message is usually found in the "results.solv" output file:Density or Pressure Problem: trying damping factor = 0.015
In this case, it can be useful to visualize the area of the flow solution where the non-physical quantity appears with visualization software such as Tecplot. Below are instructions on how to do this with Tecplot: