I use fluent to simulate species transport. The medium is sulfur hexafluoride and air. There is a density item under the mixture, and there is also under the fluid. Is there any difference between this? and i wanna use boussinesq approximation,But the density item under mixture does not have this option，what should i do？
The density under the properties is for the species only, while that for mixture is for the mixture and you need to evaluate it from such a relation in terms of the mass fraction and set it with the mixture properties. Yes, Boussinesq is not activated within density in species model and if you are willing to involve it you need here to use a UDF to include both of the solutal and thermal expansion coefficients.
The density just for one phase, u need to set up for combine.
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