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Old   May 26, 2010, 19:03
Question about characteristic length
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L.Y LIN
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hi guys ,i met this problem:
i use euler equation to solve the problem of shock wave impacting on a concave reflector ,and i choose the
character length different as:
case A:L=0.01m,
case B:L=0.001m(it means that the real shape of A is larger than case B)
i really found some differences about the shawdow image of the system ,case A is 'sharper' than
case B,i found that the amplitud of the second Derivative doubled case A near the shock wave with the same dimensionless cordinates,this really influence some
structure of the fluid .this can be very confusion for the equation i chosed is euler equation not
NS equation,so the main similar variable is Mach number not RE,the Length should be meanless .this
really confused me ,could anyone give me some light .thanks!
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