Problems With courant number Icofoam
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Hi all
running a simple pipe with 4 outlets. 16mm dia and 800 long ( 3 m/sec volocity ( too fast?? for Icofoam ?) through 2 right angle bends and exercise in learning. Exported as STEP ,set up and meshed in Salome , exported using ideasToFoam so far so good , Calculated the courant Number as per instructions. ( problem 1 when exporting a mesh where is the cell size < I used checkmesh but.... Used Netgen I THINK the cell size is 0.3) I can get it to run but only with the following control dict application icoFoam; startFrom startTime; startTime 0; stopAt endTime; endTime 0.008; deltaT 0.004;//0.005; writeControl timeStep; writeInterval 1; purgeWrite 0; writeFormat ascii; writePrecision 9; writeCompression uncompressed; timeFormat general; timePrecision 9; any other changes or outside of the ratio..0.008 to 0.004 and I get a large courant number and a floating point exception even with a ridiculously small time step and end time What am I doing wrong ? Have I defined the problem correctly do you think? Kind regards Stephen |
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