Difference between revisions of "Contrib/CompressibleMixingPhaseChangeFoam"
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Mkraposhin (Talk | contribs) (→Model Equations) |
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mixture density <math> \rho </math> calculated as | mixture density <math> \rho </math> calculated as | ||
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<math>\rho = \alpha_l \rho_l + \alpha_v \rho_v </math> | <math>\rho = \alpha_l \rho_l + \alpha_v \rho_v </math> | ||
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* Liquid volume transport | * Liquid volume transport |
Revision as of 20:55, 28 December 2012
Solver for two fluids with phase change (for example - water <---> steam), pressure and temperature density dependence
Model Equations
- Equation of state
Low-compressible fluid:
Ideal gas:
By combining this equations, we can get general relation:
where computed with respect to previous formulations
mixture density calculated as
- Liquid volume transport
Let us consider transport of liquid (heavy phase) volume fraction :
By converting to volume fluxes we get:
Using equation of state, we can reformulate substantial derivative for density in terms of pressure for any phase:
- General rule for converting from mass to volume fluxes in transport equation
- Momentum equation (velocity prediction)
\frac {\partial \rho \textbf{U}}{\partial t}
* Phase change model * Energy equation