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-   -   Fluid mechanics / drag & lift (http://www.cfd-online.com/Forums/main/5348-fluid-mechanics-drag-lift.html)

Jamcam October 31, 2002 05:39

Fluid mechanics / drag & lift
 
Hi folks,

This may seem a bit basic, but how do you go about calculating drag and lift of a sphere in a Newtonian fluid? I know the equations for this, but I don't know the respective coefficients. Do the coefficients have to be determined experimentally for my particular setup? Can I use the standard drag curve using a particle reynolds number? If so, do I use the velocity which the particle is experiencing at that point, or the settling velocity? And how do I find the settling velocity? Are there any ways to calculate the lift coefficient without knowing the drag force? The more I look at this problem, it seems to me that some experimental results (e.g. drag/lift measurements, settling velocities) are needed to complete my calculations. Is this correct, or are there other ways?

Best Regards,

Jamcam


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