Initial Values
The Initial Values node adds initial values for the mixture velocity, pressure, and volume fraction of the dispersed phase, that can serve as an initial condition for a transient simulation or as an initial guess for a nonlinear solver.
Initial Values
Enter values or expressions for the following dependent variables:
•
Velocity field, mixture, the components of j (SI unit: m/s). The defaults are 0 m/s.
•
Pressure p (SI unit: Pa). The default is 0 Pa.
•
Volume fraction, dispersed phase (dimensionless). The default is 0.
•
If the Solve for interfacial area checkbox is selected for the physics interface, enter an initial value for the Number density, dispersed phase nd (SI unit: 1/m3). The default is 0 1/m3.
•
If a Schiller-Naumann or a Haider-Levenspiel slip model is used in the physics interface, enter an initial value for the Squared slip velocity slipvel (SI unit: m2/s2). The default is 0.081 m2/s2.
For the Mixture Model, Turbulent Flow interfaces, initial values for the turbulence variables should be also specified. Additional initial values may be required for:
•
Turbulent kinetic energy k
•
Turbulent dissipation rate ep
•
Reciprocal wall distance G
•
Specific dissipation rate om
•
Undamped turbulent kinematic viscosity υ0
•
Wall distance in viscous units yPlus
•
Tangential velocity in viscous units uPlus
•
Turbulent relative fluctuations zeta
•
Elliptic blending function alpha
The following sections describe the available boundary conditions for the mixture and the dispersed phase volume fraction. In all equations, n denotes the outward pointing unit vector normal to the boundary.