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direction of porosity

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Old   February 23, 2005, 17:17
Default direction of porosity
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shin
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I have a problem with direction vector in porous medium. In determining direction vector for viscous and inertial resistance, I only can chose cartisian coordinate. In my simulation, the resistances have two distinct value for radial and tangential direction. Does anyone know how can I set the direction vector in r, theta coordinate?

Thanks in advance
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