Difference between revisions of "Contrib/CompressibleMixingPhaseChangeFoam"
From OpenFOAMWiki
< Contrib
Mkraposhin (Talk | contribs) (→Model Equations) |
Mkraposhin (Talk | contribs) (→Model Equations) |
||
Line 35: | Line 35: | ||
\frac {\partial \alpha_l}{\partial t} + \nabla \cdot | \frac {\partial \alpha_l}{\partial t} + \nabla \cdot | ||
\left ( | \left ( | ||
− | \alpha_l \ | + | \alpha_l \textbf{U} |
\right ) | \right ) | ||
= \frac {\alpha_l}{\rho_l} \frac {d \rho_l}{dt} + \frac {\dot m_l}{\rho_l} | = \frac {\alpha_l}{\rho_l} \frac {d \rho_l}{dt} + \frac {\dot m_l}{\rho_l} | ||
Line 48: | Line 48: | ||
</math> | </math> | ||
+ | * General rule for converting from mass to volume fluxes in transport equation | ||
+ | <math> | ||
+ | \frac{\partial \alpha_i \rho_i \zeta}{\partial t} | ||
+ | + | ||
+ | \nabla \cdot | ||
+ | \left ( | ||
+ | \alpha_i \rho_i \textbf{U} \zeta | ||
+ | \right ) | ||
+ | </math> | ||
* Phase change model | * Phase change model |
Revision as of 20:42, 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