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How do I convert a P-Q curve into the appropriate input data for the FAN_COMPONENT command?

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The FAN_COMPONENT simply adds body forces to the flow field to model the effect of the fan. There are two types of fan that are supported....an axial fan, and a radial fan. An axial fan is similar to the cooling fan in front of a car radiator. The flow enters along the axis of rotation, and the fan imparts a pressure rise to the flow. A radial fan (also known as a centrifugal fan) is typically enclosed in a housing, and the flow enters along the axis of rotation but exits perpendicular to the axis of rotation. An example of this would be the blower in the heating system of a car or a turbocharger.


When defining a FAN_COMPONENT, a body force is added to all of the volume elements in the parent element set of the surface. So, separate element set should be used to model the fan. The fan_thickness should correspond to the length of the element set. The magnitude of the body force is given by the equations shown in the Command Reference Manual. The axial, radial, and tangential pressure drops can all be modeled.


The attached example illustrates the steps necessary to convert a P-Q into the appropriate input data for FAN_COMPONENT when modeling a radial fan with an axial coefficient of type=bilinear_curve_fit. This example utilizes an axial coefficient that is constant with radius, but varies with flow rate through the fan.


 


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