If you mean the FIX cell condition you set whatever values you want, and Fluent will try and resolve the gradients etc. If the values are sensible the solver will generally give a good result albeit with some convergence issues depending on the mesh etc. As those convergence issue worsen so too does mass conservation.Â
Are you using fluid mass or scalar mass in the above check? The latter don't have a density so rely on the fluid properties.Â
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