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:
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Velocity field, mixture, the components of j (SI unit: m/s). The defaults are 0 m/s.
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Pressure p (SI unit: Pa). The default is 0 Pa.
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Volume fraction, dispersed phase (dimensionless). The default is 0.
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If the Solve for interfacial area check box 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.
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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:
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Turbulent kinetic energy k
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Turbulent dissipation rate ep
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Reciprocal wall distance G
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Specific dissipation rate om
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Undamped turbulent kinematic viscosity υ0
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Wall distance in viscous units yPlus
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Tangential velocity in viscous units uPlus
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Turbulent relative fluctuations zeta
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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.