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return zero for powers with negative base

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This commit is contained in:
Stein Krogstad 2023-12-05 21:28:54 +01:00
parent 338c210985
commit a483839caa
1 changed files with 16 additions and 10 deletions
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26
opm/simulators/wells/MultisegmentWellSegments.cpp
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@ -637,8 +637,9 @@ pressureDropSpiralICD(const int seg,
using MathTool = MathToolbox<EvalWell>;
const double density_cali = sicd.densityCalibration();
const EvalWell temp_value1 = MathTool::pow(density / density_cali, 0.75);
const EvalWell temp_value2 = MathTool::pow(mixture_viscosity / viscosity_cali, 0.25);
// make sure we don't pass negative base to powers
const EvalWell temp_value1 = density > 0.0 ? MathTool::pow(density / density_cali, 0.75) : 0.0;
const EvalWell temp_value2 = mixture_viscosity > 0.0 ? MathTool::pow(mixture_viscosity / viscosity_cali, 0.25) : 0.0;
// formulation before 2016, base_strength is used
// const double base_strength = sicd.strength() / density_cali;
@ -735,13 +736,18 @@ pressureDropAutoICD(const int seg,
}
using MathTool = MathToolbox<EvalWell>;
const EvalWell mixture_viscosity = MathTool::pow(water_fraction, aicd.waterViscExponent()) * water_viscosity
+ MathTool::pow(oil_fraction, aicd.oilViscExponent()) * oil_viscosity
+ MathTool::pow(gas_fraction, aicd.gasViscExponent()) * gas_viscosity;
// make sure we don't pass negative base to powers
auto safe_pow = [](const auto a, const double b) {
return a > 0.0 ? MathTool::pow(a,b) : 0.0;
};
const EvalWell mixture_density = MathTool::pow(water_fraction, aicd.waterDensityExponent()) * water_density
+ MathTool::pow(oil_fraction, aicd.oilDensityExponent()) * oil_density
+ MathTool::pow(gas_fraction, aicd.gasDensityExponent()) * gas_density;
const EvalWell mixture_viscosity = safe_pow(water_fraction, aicd.waterViscExponent()) * water_viscosity
+ safe_pow(oil_fraction, aicd.oilViscExponent()) * oil_viscosity
+ safe_pow(gas_fraction, aicd.gasViscExponent()) * gas_viscosity;
const EvalWell mixture_density = safe_pow(water_fraction, aicd.waterDensityExponent()) * water_density
+ safe_pow(oil_fraction, aicd.oilDensityExponent()) * oil_density
+ safe_pow(gas_fraction, aicd.gasDensityExponent()) * gas_density;
const double rho_reference = aicd.densityCalibration();
const double visc_reference = aicd.viscosityCalibration();
@ -753,8 +759,8 @@ pressureDropAutoICD(const int seg,
// TODO: we did not consider the maximum allowed rate here
const auto result = sign / rho_reference * mixture_density * mixture_density
* MathTool::pow(visc_reference/mixture_viscosity, aicd.viscExponent())
* aicd.strength() * MathTool::pow( -sign * volume_rate_icd, aicd.flowRateExponent())
* safe_pow(visc_reference/mixture_viscosity, aicd.viscExponent())
* aicd.strength() * safe_pow( -sign * volume_rate_icd, aicd.flowRateExponent())
* std::pow(unit_volume_rate, (2. - aicd.flowRateExponent())) ;
return result;
}