Tagged: cfdpost, fluiddynamics, General


March 17, 2023 at 8:58 amFAQParticipant
The frontal area can be calculated with the following CEL: IntegrationVariable = Normal X/abs(Normal X + 1e8) FrontalArea = 0.5 * areaInt_x( IntegrationVariable )@Body This example CEL is for the frontal area in xdirection. With areaInt_x the integral of the area components in xdirection multiplied with an integration variable Phi is obtained. To obtain the area in xdirection, the integration variable must have a value of 1. However, as the xcomponent of the areas has a sign, the expression areaInt_x(1)@body will result in a value of zero for a closed surface. So use the integration variable Phi = Normal X/abs(Normal X) to obtain a +1 or 1 depending on the local area, and hence to obtain the integral of the absolute values of the area xcomponent. The small number is just required to avoid division by zero for area that have no xcomponent. The result is the double of the frontal area, so include the 0.5 to get the correct frontal area. Note that this approach works only for convex surfaces.

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