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Significance of COURANT nUMBER

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Old   September 9, 2007, 18:13
Default Significance of COURANT nUMBER
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sridhar
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Hi everyone, I am doing supersonic flow study in a combustor.I want to know how important is the effect of Courant number on the solution ,convergence etc. I am presently using Courant number of 0.5. How far can I change it from my present value to get better results.

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Old   September 10, 2007, 12:56
Default Re: Significance of COURANT nUMBER
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Joe
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A CN of less than 1 is always satisfactory for an implicit solver. Practically a RMS CN <= 1 and MAX CN <= 5-10 is usually satisfactory for adaquate accuracy for an implicit solver. You can go bigger but you must then show solution insensitivity to a CN > 1.
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Old   September 12, 2007, 11:47
Default Re: Significance of COURANT nUMBER
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sridhar
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thanks for the rply .. just help me out with another small doubt of mine ..mine is an injection problem and the main flow is supersonic with sonic injection .I would like to know . should I start with UNSTEADY solution or start with STEDY SOLN and then switch to unsteady solution.. Please suggest ..thanks
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Old   September 26, 2007, 16:14
Default Re: Significance of COURANT nUMBER
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Kaiser Matin
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Start with a steady solution and then do the unsteady soultion.
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