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Include all derivatives for acceleration term in MS wells

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This commit is contained in:
Stein Krogstad
2024-01-09 11:59:07 +01:00
parent 3c1481df04
commit cdb43d917b
6 changed files with 103 additions and 64 deletions
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49
opm/simulators/wells/MultisegmentWellEval.cpp
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@@ -198,20 +198,51 @@ extendEval(const Eval& in) const
template<typename FluidSystem, typename Indices, typename Scalar>
void
MultisegmentWellEval<FluidSystem,Indices,Scalar>::
handleAccelerationPressureLoss(const int seg,
WellState& well_state)
assembleAccelerationPressureLoss(const int seg,
WellState& well_state)
{
const EvalWell accelerationPressureLoss = segments_.accelerationPressureLoss(seg);
// Computes and assembles p-drop due to acceleration
assert(seg != 0); // top segment can not enter here
auto& segments = well_state.well(baseif_.indexOfWell()).segments;
segments.pressure_drop_accel[seg] = accelerationPressureLoss.value();
const auto& segment_set = this->segmentSet();
// Add segment head
const double seg_area = segment_set[seg].crossArea();
const EvalWell signed_velocity_head = segments_.accelerationPressureLossContribution(seg, seg_area);
segments.pressure_drop_accel[seg] = signed_velocity_head.value();
const int seg_upwind = segments_.upwinding_segment(seg);
// acceleration term is *subtracted* from pressure equation
MultisegmentWellAssemble<FluidSystem,Indices,Scalar>(baseif_).
assemblePressureLoss(seg,
segments_.upwinding_segment(seg),
accelerationPressureLoss, linSys_);
assembleAccelerationTerm(seg, seg, seg_upwind, signed_velocity_head, linSys_);
if (seg != seg_upwind) {// special treatment for reverse flow
// extra derivatives are *added* to Jacobian (hence minus)
const EvalWell extra_derivatives = -segments_.accelerationPressureLossContribution(seg, seg_area, /*extra_derivatives*/ true);
MultisegmentWellAssemble<FluidSystem,Indices,Scalar>(baseif_).
assemblePressureEqExtraDerivatives(seg, seg_upwind, extra_derivatives, linSys_);
}
// Subtract inlet head(s), opposite signs from above
for (const int inlet : segments_.inlets(seg)) {
// area used in formula is max of areas
const double inlet_area = std::max(seg_area, segment_set[inlet].crossArea());
const EvalWell signed_velocity_head_inlet = segments_.accelerationPressureLossContribution(inlet, inlet_area);
segments.pressure_drop_accel[seg] -= signed_velocity_head_inlet.value();
const int inlet_upwind = segments_.upwinding_segment(inlet);
MultisegmentWellAssemble<FluidSystem,Indices,Scalar>(baseif_).
assembleAccelerationTerm(seg, inlet, inlet_upwind, -signed_velocity_head_inlet, linSys_);
if (inlet != inlet_upwind) {// special treatment for reverse flow
// extra derivatives are *added* to Jacobian (hence minus minus)
const EvalWell extra_derivatives_inlet = segments_.accelerationPressureLossContribution(inlet, inlet_area, /*extra_derivatives*/ true);
// in this case inlet_upwind = seg
MultisegmentWellAssemble<FluidSystem,Indices,Scalar>(baseif_).
assemblePressureEqExtraDerivatives(seg, inlet_upwind, extra_derivatives_inlet, linSys_);
}
}
}
template<typename FluidSystem, typename Indices, typename Scalar>
void
MultisegmentWellEval<FluidSystem,Indices,Scalar>::
@@ -352,7 +383,7 @@ assembleAccelerationAndHydroPressureLosses(const int seg,
const bool use_average_density)
{
if (this->accelerationalPressureLossConsidered()) {
handleAccelerationPressureLoss(seg, well_state);
assembleAccelerationPressureLoss(seg, well_state);
}
// Since density derivatives are organized differently than what is required for assemblePressureEq,