The reference values are used for various coefficients (lift, drag etc) so would be tuned to whatever datum is needed. Generally I don't use the coefficients so I leave the reference values alone.Â
The operating conditions are there to set gauge (ambient) pressure, so I'd tend to set the operating pressure to ambient (the default is 101325Pa ie 1atm) and that allows you to set the gauge value on the boundaries. Or I'd set as zero depending on the application; density also needs some care in certain circumstances. So same principle but I suspect the terminology/labelling is switched.Â
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