The key change implemented in FDS 6.5.0 is to include the baroclinic term in the pressure iteration scheme. This corrects a time lag between the hyrdodynamic pressure in the baroclinic term and the output from the pressure Poisson equation.
Other improvements implemented in this version include an optional iteration in the radiation solve for multi-mesh simulations and more accurate interpolation of particle force terms. More information is given in the Release Notes.
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