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Normal Vector on Curved Surfaces

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Old   July 2, 2001, 04:35
Default Normal Vector on Curved Surfaces
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For a radial fan i have to calculate the rate of mechanical work performed at moving walls, which are fixed in the relative system. To calculate this work i need the compute the unit normal vector on the wall area elements. Normally, these elements have curved surfaces (eg. blades). How can i access these normal vectors with a UDF ? Or is it possible do compute them with a simple custom field function ?
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