/// <summary>
/// Declaration of the spatial operator
/// </summary>
protected override SpatialOperator GetOperatorInstance(int D)
{
// instantiate boundary condition mapping
// ======================================
boundaryCondMap = new IncompressibleBoundaryCondMap(this.GridData, this.Control.BoundaryValues, PhysicsMode.Incompressible);
// instantiate operator
// ====================
string[] CodName = (new[] { "ResidualMomentumX", "ResidualMomentumY", "ResidualMomentumZ" }).GetSubVector(0, D).Cat("ResidualConti");
var op = new SpatialOperator(
__DomainVar: VariableNames.VelocityVector(D).Cat(VariableNames.Pressure),
__ParameterVar: VariableNames.GravityVector(D),
__CoDomainVar: CodName,
QuadOrderFunc: QuadOrderFunc.NonLinear(2));
op.LinearizationHint = LinearizationHint.GetJacobiOperator;
// Temporal Operator
// =================
var TempOp = new ConstantTemporalOperator(op, 0.0); // init with entire diagonal set to 0.0
op.TemporalOperator = TempOp;
for (int d = 0; d < D; d++)
{
TempOp.SetDiagonal(CodName[d], Control.Density); // set momentum equation entries to density
}
// Pressure Reference
// ==================
// if there is no Dirichlet boundary condition,
// the mean value of the pressure is free:
op.FreeMeanValue[VariableNames.Pressure] = !boundaryCondMap.DirichletPressureBoundary;
// Momentum Equation
// =================
// convective part:
{
for (int d = 0; d < D; d++)
{
var comps = op.EquationComponents[CodName[d]];
var ConvBulk = new LocalLaxFriedrichsConvection(D, boundaryCondMap, d, Control.Density);
comps.Add(ConvBulk); // bulk component
}
}
// pressure part:
{
for (int d = 0; d < D; d++)
{
var comps = op.EquationComponents[CodName[d]];
var pres = new PressureGradientLin_d(d, boundaryCondMap);
comps.Add(pres); // bulk component
}
}
// viscous part:
{
for (int d = 0; d < D; d++)
{
var comps = op.EquationComponents[CodName[d]];
double penalty_bulk = this.Control.PenaltySafety;
var Visc = new swipViscosity_Term1(penalty_bulk, d, D, boundaryCondMap,
ViscosityOption.ConstantViscosity,
constantViscosityValue: Control.Viscosity);
comps.Add(Visc); // bulk component GradUTerm
}
}
// Continuity equation
// ===================
{
for (int d = 0; d < D; d++)
{
var src = new Divergence_DerivativeSource(d, D);
var flx = new Divergence_DerivativeSource_Flux(d, boundaryCondMap);
op.EquationComponents[CodName[D]].Add(src);
op.EquationComponents[CodName[D]].Add(flx);
}
//IBM_Op.EquationComponents["div"].Add(new PressureStabilization(1, 1.0 / this.Control.PhysicalParameters.mu_A));
}
// Gravity parameter
// =================
op.ParameterFactories.Add(delegate(IReadOnlyDictionary <string, DGField> DomainVarFields) {
return(D.ForLoop(d => (VariableNames.Gravity_d(d), this.Gravity[d] as DGField)));
});
// commit & return
// ===============
op.Commit();
return(op);
}