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It is important to check the operating conditions. When setting the density in materials to ideal gas, FLUENT calculates the density using the absolute pressure. However, the pressure we specify is the gauge pressure, not the absolute pressure. FLUENT will use the absolute pressure to compute the density therefore if we do not set the operating pressure to 0 our density will be incorrect for the flow field.  

Reference Values

In the Outline window, select Reference Values. Change the Compute From parameter to farfield. Check that the values are accurate. The reference values are used when calculating the non-dimensional results such as the drag coefficient.

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