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Which ranges of k,epsilon,omega are reasonable and acceptable?

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Old   May 19, 2013, 13:46
Default Which ranges of k,epsilon,omega are reasonable and acceptable?
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In some cases like turbulent cavity:
tutorials/incompressible/pisoFoam/ras/cavity k is set to .00325 and epsilon to .000765

but for example in prism case:
tutorials/compressible/sonicFoam/ras/prism k is set to 1000 and epsilon 266000

what decision rule is behind the selection of values of turbulence coefficients?
please someone interested guide.
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