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Inluding all derivatives for reversed flow

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This commit is contained in:
Stein Krogstad 2023-05-09 22:54:24 +02:00
parent 809f6d19ef
commit e5ac9f9dec
5 changed files with 87 additions and 12 deletions
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29
opm/simulators/wells/MultisegmentWellAssemble.cpp
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@ -216,6 +216,35 @@ assemblePressureLoss(const int seg,
}
}
template<class FluidSystem, class Indices, class Scalar>
void MultisegmentWellAssemble<FluidSystem,Indices,Scalar>::
assembleHydroPressureLoss(const int seg,
const int seg_upwind,
const EvalWell& hydro_pressure_drop,
Equations& eqns1) const
{
MultisegmentWellEquationAccess<Scalar,numWellEq,Indices::numEq> eqns(eqns1);
eqns.residual()[seg][SPres] -= hydro_pressure_drop.value();
for (int pv_idx = 0; pv_idx < numWellEq; ++pv_idx) {
eqns.D()[seg][seg_upwind][SPres][pv_idx] -= hydro_pressure_drop.derivative(pv_idx + Indices::numEq);
}
}
template<class FluidSystem, class Indices, class Scalar>
void MultisegmentWellAssemble<FluidSystem,Indices,Scalar>::
assemblePressureEqExtraDerivatives(const int seg,
const int seg_upwind,
const EvalWell& extra_derivatives,
Equations& eqns1) const
{
MultisegmentWellEquationAccess<Scalar,numWellEq,Indices::numEq> eqns(eqns1);
// diregard residual
// Frac - derivatives are zero (they belong to upwind^2)
eqns.D()[seg][seg_upwind][SPres][SPres] += extra_derivatives.derivative(SPres + Indices::numEq);
eqns.D()[seg][seg_upwind][SPres][WQTotal] += extra_derivatives.derivative(WQTotal + Indices::numEq);
}
template<class FluidSystem, class Indices, class Scalar>
void MultisegmentWellAssemble<FluidSystem,Indices,Scalar>::
assemblePressureEq(const int seg,

11
opm/simulators/wells/MultisegmentWellAssemble.hpp
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@ -87,6 +87,17 @@ public:
const EvalWell& accelerationPressureLoss,
Equations& eqns) const;
void assembleHydroPressureLoss(const int seg,
const int seg_upwind,
const EvalWell& hydro_pressure_drop,
Equations& eqs1) const;
void assemblePressureEqExtraDerivatives(const int seg,
const int seg_upwind,
const EvalWell& extra_derivatives,
Equations& eqns1) const;
//! \brief Assemble pressure terms.
void assemblePressureEq(const int seg,
const int seg_upwind,

26
opm/simulators/wells/MultisegmentWellEval.cpp
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@ -217,22 +217,27 @@ assembleDefaultPressureEq(const int seg,
WellState& well_state)
{
assert(seg != 0); // not top segment
const int seg_upwind = segments_.upwinding_segment(seg);
const bool reverseFlow = seg != seg_upwind;
// for top segment, the well control equation will be used.
EvalWell pressure_equation = primary_variables_.getSegmentPressure(seg);
EvalWell extra_derivatives;
// we need to handle the pressure difference between the two segments
// we only consider the hydrostatic pressure loss first
// TODO: we might be able to add member variables to store these values, then we update well state
// after converged
const auto hydro_pressure_drop = segments_.getHydroPressureLoss(seg);
auto& ws = well_state.well(baseif_.indexOfWell());
auto& segments = ws.segments;
segments.pressure_drop_hydrostatic[seg] = hydro_pressure_drop.value();
pressure_equation -= hydro_pressure_drop;
//pressure_equation -= hydro_pressure_drop;
if (this->frictionalPressureLossConsidered()) {
const auto friction_pressure_drop = segments_.getFrictionPressureLoss(seg);
const auto friction_pressure_drop = segments_.getFrictionPressureLoss(seg, false);
if (reverseFlow){
extra_derivatives = -segments_.getFrictionPressureLoss(seg, true);
}
pressure_equation -= friction_pressure_drop;
segments.pressure_drop_friction[seg] = friction_pressure_drop.value();
}
@ -241,14 +246,25 @@ assembleDefaultPressureEq(const int seg,
const int outlet_segment_index = this->segmentNumberToIndex(this->segmentSet()[seg].outletSegment());
const EvalWell outlet_pressure = primary_variables_.getSegmentPressure(outlet_segment_index);
const int seg_upwind = segments_.upwinding_segment(seg);
//const int seg_upwind = segments_.upwinding_segment(seg);
MultisegmentWellAssemble<FluidSystem,Indices,Scalar>(baseif_).
assemblePressureEq(seg, seg_upwind, outlet_segment_index,
pressure_equation, outlet_pressure, linSys_);
if (reverseFlow){
MultisegmentWellAssemble<FluidSystem,Indices,Scalar>(baseif_).
assemblePressureEqExtraDerivatives(seg, seg_upwind, extra_derivatives, linSys_);
}
if (this->accelerationalPressureLossConsidered()) {
handleAccelerationPressureLoss(seg, well_state);
}
// Do separately since different organization of derivatives
const auto hydro_pressure_drop = segments_.getHydroPressureLoss(seg);
MultisegmentWellAssemble<FluidSystem,Indices,Scalar>(baseif_).
assembleHydroPressureLoss(seg, seg_upwind, hydro_pressure_drop, linSys_);
segments.pressure_drop_hydrostatic[seg] = hydro_pressure_drop.value();
}
template<typename FluidSystem, typename Indices, typename Scalar>

31
opm/simulators/wells/MultisegmentWellSegments.cpp
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@ -322,10 +322,12 @@ template<class FluidSystem, class Indices, class Scalar>
typename MultisegmentWellSegments<FluidSystem,Indices,Scalar>::EvalWell
MultisegmentWellSegments<FluidSystem,Indices,Scalar>::
getHydroPressureLoss(const int seg) const
{
return densities_[seg] * well_.gravity() * depth_diffs_[seg];
{
const int seg_upwind = upwinding_segments_[seg];
return densities_[seg_upwind] * well_.gravity() * depth_diffs_[seg];
}
template<class FluidSystem, class Indices, class Scalar>
Scalar MultisegmentWellSegments<FluidSystem,Indices,Scalar>::
getPressureDiffSegPerf(const int seg,
@ -484,19 +486,36 @@ getSurfaceVolume(const EvalWell& temperature,
template<class FluidSystem, class Indices, class Scalar>
typename MultisegmentWellSegments<FluidSystem,Indices,Scalar>::EvalWell
MultisegmentWellSegments<FluidSystem,Indices,Scalar>::
getFrictionPressureLoss(const int seg) const
getFrictionPressureLoss(const int seg, const bool return_upwind_derivatives) const
{
const EvalWell mass_rate = mass_rates_[seg];
EvalWell mass_rate = mass_rates_[seg];
const int seg_upwind = upwinding_segments_[seg];
EvalWell density = densities_[seg_upwind];
EvalWell visc = viscosities_[seg_upwind];
// WARNING
// We disregard the derivatives from the upwind density to make sure derivatives
// wrt. to different segments dont get mixed.
if (seg != seg_upwind) {
density.clearDerivatives();
visc.clearDerivatives();
if (!return_upwind_derivatives){
const int WQTotal = Indices::numEq + PrimaryVariables::WQTotal;
const int SPres = Indices::numEq + PrimaryVariables::SPres;
density.setDerivative(WQTotal, 0.0);
density.setDerivative(SPres, 0.0);
visc.setDerivative(WQTotal, 0.0);
visc.setDerivative(SPres, 0.0);
} else {
const int WFrac = Indices::numEq + PrimaryVariables::WFrac;
const int GFrac = Indices::numEq + PrimaryVariables::GFrac;
// if has ...
density.setDerivative(WFrac, 0.0);
density.setDerivative(GFrac, 0.0);
visc.setDerivative(WFrac, 0.0);
visc.setDerivative(GFrac, 0.0);
mass_rate.clearDerivatives();
}
}
const auto& segment_set = well_.wellEcl().getSegments();
const int outlet_segment_index = segment_set.segmentNumberToIndex(segment_set[seg].outletSegment());
const double length = segment_set[seg].totalLength() - segment_set[outlet_segment_index].totalLength();

2
opm/simulators/wells/MultisegmentWellSegments.hpp
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@ -63,7 +63,7 @@ public:
const int pvt_region_index,
const int seg_idx) const;
EvalWell getFrictionPressureLoss(const int seg) const;
EvalWell getFrictionPressureLoss(const int seg, const bool return_upwind_derivatives) const;
// pressure drop for Spiral ICD segment (WSEGSICD)
EvalWell pressureDropSpiralICD(const int seg) const;