efad85b0e6
The calculations for mixture rho and U have been changed so that they represent phase-averaged quantities over the moving phases only. The mixture density is used as part of the pressure solution to calculate buoyancy forces. The pressure within a stationary phase is considered to be decoupled from the moving phases; i.e., it is considered self-supporting. Therefore the stationary phase density should not form a part of buoyancy calculations. This change to the definition of mixture density ensures this.
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