Difference between revisions of "Contrib/CompressibleMixingPhaseChangeFoam"
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Mkraposhin (Talk | contribs) (→Model Equations) |
Mkraposhin (Talk | contribs) (→Model Equations) |
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\alpha_i \rho_i \textbf{U} \zeta | \alpha_i \rho_i \textbf{U} \zeta | ||
\right ) | \right ) | ||
+ | = \rho_i \alpha_i | ||
+ | \left ( | ||
+ | \frac {\partial \zeta}{\partial t} + \nabla \cdot \left ( \textbf{U} \zeta \right ) | ||
+ | \right ) | ||
+ | + | ||
+ | \zeta \alpha_l \frac {d \rho_i}{dt} + \zeta \rho_i \frac {d \alpha_i}{dt} | ||
</math> | </math> | ||
Revision as of 20:48, 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
- 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
* Phase change model * Momentum equation * Energy equation