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ghost fluid method (shock tube problem)

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Old   March 1, 2009, 06:16
Default ghost fluid method (shock tube problem)
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I wnat to solve shock tube problem by ghost fluid method as a boundary condition at the discontiniuty. (such as Fedkew's paper 'GFM for shocks,detonation and deflagration') but in Rieman problem, at first there is not shock and after a very short time shock will appear.

In period of time that shock does not exist, can I use ghost fluid boundary condition for shock? or should I use GFM method after the shock appear?

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