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include/tuvx/radiative_transfer/solvers/delta_eddington.inl
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| // Copyright (C) 2023-2024 National Center for Atmospheric Research | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
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| namespace tuvx | ||
| { | ||
| template<typename T, typename ArrayPolicy, typename RadiatorStatePolicy> | ||
| void DeltaEddingtonApproximation( | ||
| inline void EddingtonApproximation( | ||
| const std::size_t& number_of_columns, | ||
| const std::size_t& number_of_wavelengths, | ||
| const std::size_t& number_of_layers, | ||
| const RadiatorStatePolicy& accumulated_radiator_states, | ||
| const std::map<std::string, std::vector<T>> solution_parameters, | ||
| const std::vector<T> solar_zenith_angles) | ||
| const std::vector<T>& solar_zenith_angles, | ||
| ApproximationVariables<ArrayPolicy>& approximation_variables) | ||
| { | ||
| // allocate memory for the approximation parameters | ||
| approximation_variables.gamma1_ = tuvx::Array3D<double>(number_of_layers, number_of_wavelengths, number_of_columns); | ||
| approximation_variables.gamma2_ = tuvx::Array3D<double>(number_of_layers, number_of_wavelengths, number_of_columns); | ||
| approximation_variables.gamma3_ = tuvx::Array3D<double>(number_of_layers, number_of_wavelengths, number_of_columns); | ||
| approximation_variables.gamma4_ = tuvx::Array3D<double>(number_of_layers, number_of_wavelengths, number_of_columns); | ||
| approximation_variables.mu_ = tuvx::Array3D<double>(number_of_layers, number_of_wavelengths, number_of_columns); | ||
| approximation_variables.lambda_ = tuvx::Array3D<double>(number_of_layers, number_of_wavelengths, number_of_columns); | ||
| approximation_variables.gamma_ = tuvx::Array3D<double>(number_of_layers, number_of_wavelengths, number_of_columns); | ||
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| const std::size_t number_of_columns = solar_zenith_angles.size(); | ||
| ArrayPolicy& omega = accumulated_radiator_states.optical_depth_; | ||
| ArrayPolicy& g = accumulated_radiator_states.single_scattering_albedo_; | ||
| ArrayPolicy& tau = accumulated_radiator_states.assymetry_parameter_; | ||
| // unpack optical properties from radiator | ||
| auto& omega = accumulated_radiator_states.optical_depth_; | ||
| auto& g = accumulated_radiator_states.single_scattering_albedo_; | ||
| auto& tau = accumulated_radiator_states.asymmetry_parameter_; | ||
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| // delta eddington parameters | ||
| std::vector<T>& gamma1 = solution_parameters.at("gamma1"); | ||
| std::vector<T>& gamma2 = solution_parameters.at("gamma2"); | ||
| std::vector<T>& gamma3 = solution_parameters.at("gamma3"); | ||
| std::vector<T>& gamma4 = solution_parameters.at("gamma4"); | ||
| std::vector<T>& mu = solution_parameters.at("mu"); | ||
| std::vector<T>& lambda = solution_parameters.at("lambda"); | ||
| std::vector<T>& gamma = solution_parameters.at("Gamma"); | ||
| // unpack delta eddington variables | ||
| auto& gamma1 = approximation_variables.gamma1_; | ||
| auto& gamma2 = approximation_variables.gamma2_; | ||
| auto& gamma3 = approximation_variables.gamma3_; | ||
| auto& gamma4 = approximation_variables.gamma4_; | ||
| auto& lambda = approximation_variables.lambda_; | ||
| auto& gamma = approximation_variables.gamma_; | ||
| auto& mu = approximation_variables.mu_; | ||
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| // simulation parameters | ||
| T mu_0; | ||
| for (std::size_t i = 0; i < number_of_columns; i++) | ||
| for (std::size_t i = 0; i < number_of_layers; i++) | ||
| { | ||
| // compute delta eddington parameters | ||
| mu_0 = std::acos(solar_zenith_angles[i]); | ||
| gamma1[i] = 7 - omega[i] * (4 + 3 * g[i]); | ||
| gamma2[i] = -(1 - omega[i] * (4 - 3 * g[i])) / 4; | ||
| gamma3[i] = (2 - 3 * g[i] * mu_0) / 4; | ||
| gamma4[i] = 1 - gamma3[i]; | ||
| lambda[i] = std::sqrt(gamma1[i] * gamma1[i] - gamma2[i] * gamma2[i]); | ||
| gamma[i] = (gamma1[i] - lambda[i]) / gamma2[i]; | ||
| mu = (T)0.5; | ||
| for (std::size_t j = 0; j < number_of_wavelengths; j++) | ||
| { | ||
| for (std::size_t k = 0; k < number_of_columns; k++) | ||
| { | ||
| mu_0 = std::acos(solar_zenith_angles[i]); | ||
| gamma1(i, j, k) = 7 - omega(i, j, k) * (4 + 3 * g(i, j, k)); | ||
| gamma2(i, j, k) = -(1 - omega(i, j, k) * (4 - 3 * g(i, j, k))) / 4; | ||
| gamma3(i, j, k) = (2 - 3 * g(i, j, k) * mu_0) / 4; | ||
| gamma4(i, j, k) = 1 - gamma3(i, j, k); | ||
| lambda(i, j, k) = std::sqrt(gamma1(i, j, k) * gamma1(i, j, k) - gamma2(i, j, k) * gamma2(i, j, k)); | ||
| gamma(i, j, k) = (gamma1(i, j, k) - lambda(i, j, k)) / gamma2(i, j, k); | ||
| mu(i, j, k) = 0.5; | ||
| } | ||
| } | ||
| } | ||
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|
||
| } | ||
| } // namespace tuvx |
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