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Old   June 16, 2003, 09:08
Default Wave drag and CFD
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Zbynžk
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Dear all, has anybody an idea how to determine wave drag from CFD calculation?I need to divide total drag of transonic airplane to pressure,viscous and wave parts.Has anybody any experience with wave drag identification?
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Old   June 19, 2003, 01:26
Default Re: Wave drag and CFD
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Neale
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Estimating wave drag is like trying to figure out induced drag on a wing in a subsonic flow.

I would think that the wave drag would not be included in the pressure and viscous forces output by the flow solver because this is generally a volume effect (allthough, this may not be the case if you have shock wave induced separation).

One idea would be to get the total drag by subtracting the momentum deficit between your inlet and outlet (i.e. integral of outlet momentum - integral of inlet momentum) and then compare that number with the viscous and pressure forces.

Neale
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Old   July 9, 2003, 11:55
Default Re: Wave drag and CFD
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pao
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the invisicid flow cfd supposed to produce zero drag at subsonic flow. So if you run the flow with shock wave, the extra drag shall be the wave drag.
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