Adding new alternate neutrino cooling #1777
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| Original file line number | Diff line number | Diff line change |
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| @@ -1 +1,2 @@ | ||
| CEXE_headers += neutrino.H | ||
| CEXE_headers += sneut5.H kipp.H |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,172 @@ | ||
| // This routine calculates the neutrino cooling rates using the approximations from Kippenhahn et al. 1989 | ||
| // using autodiff | ||
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| #ifndef KIP_NEUT_H | ||
| #define KIP_NEUT_H | ||
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| #include<iostream> | ||
| #include<AMReX_REAL.H> | ||
| #include<fundamental_constants.H> | ||
| #include<microphysics_autodiff.H> | ||
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| using namespace amrex::literals; | ||
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| template<typename number_t> | ||
| AMREX_GPU_HOST_DEVICE AMREX_INLINE | ||
| // pair annihilation | ||
| number_t kip_pair(const number_t& temp, const amrex::Real& rho, | ||
| const number_t& abar, const number_t& zbar){ | ||
| number_t T9 = temp * 1.0e-9_rt; | ||
| // eq. 18.81 - fixed using woosley lecture notes | ||
| if (T9 < 2.0e0_rt){ | ||
| return (4.9e18_rt/rho) * amrex::Math::powi<3>(T9) * admath::exp(-11.86/T9); | ||
| } | ||
| else{ | ||
| return (3.2e15_rt/rho) * amrex::Math::powi<9>(T9); | ||
| } | ||
| } | ||
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| template<typename number_t> | ||
| AMREX_GPU_HOST_DEVICE AMREX_INLINE | ||
| // photoneutrinos | ||
| number_t kip_phot(const number_t& temp, const amrex::Real& rho, | ||
| const number_t& abar, const number_t& zbar){ | ||
| number_t T9 = temp * 1.0e-9_rt; | ||
| // eq. 18.82 | ||
| number_t ep_1 = (1.103e13_rt/rho) * amrex::Math::powi<9>(T9) * admath::exp(-5.93e0_rt / T9); | ||
| number_t ep_2 = 0.976e8_rt * amrex::Math::powi<8>(T9) / (1.0e0_rt + 4.2e0_rt * T9); | ||
| number_t rho_bar = 6.446e-6_rt * rho / (T9 + 4.2e0_rt * amrex::Math::powi<2>(T9)); | ||
| number_t mu_e = abar / zbar; | ||
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| return ep_1 + ep_2 / (mu_e + rho_bar); | ||
| } | ||
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| template<typename number_t> | ||
| AMREX_GPU_HOST_DEVICE AMREX_INLINE | ||
| // plasmaneutrinos | ||
| number_t kip_plas(const number_t& temp, const amrex::Real& rho, | ||
| const number_t& abar, const number_t& zbar){ | ||
| number_t n_e = rho / (C::m_u * abar/zbar); | ||
| // assuming non-degeneracy | ||
| // 18.83 replaced by aprox in woosley lecture notes | ||
| number_t w0 = admath::sqrt((4.0e0_rt * M_PI * amrex::Math::powi<2>(C::q_e) * n_e) / C::m_e); | ||
| number_t gamma = (C::hbar * w0) / (C::k_B * temp); | ||
| number_t lambda = (C::k_B * temp) / (C::m_e * amrex::Math::powi<2>(C::c_light)); | ||
| // 18.85 | ||
| if (gamma <= 1.0e0_rt) { | ||
| // return (7.4e21_rt * amrex::Math::powi<6>(C::hbar * w0/(C::m_e * amrex::Math::powi<2>(C::c_light))) | ||
| // * amrex::Math::powi<3>(lambda))/rho; | ||
| number_t epsilon_p = (C::hbar * w0) / (C::m_e * C::c_light * C::c_light); | ||
| return (7.4e21_rt * amrex::Math::powi<6>(epsilon_p) * amrex::Math::powi<3>(lambda)) / rho; | ||
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| } else{ | ||
| return (3.3e21_rt * admath::pow((C::hbar * w0/(C::m_e * amrex::Math::powi<2>(C::c_light))),7.5e0_rt) | ||
| * admath::pow(lambda, 3.0e0_rt/2.0e0_rt) * admath::exp(-gamma))/rho; | ||
| } | ||
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| } | ||
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| template<typename number_t> | ||
| AMREX_GPU_HOST_DEVICE AMREX_INLINE | ||
| // bremsstrahlung neutrinos | ||
| number_t kip_brem(const number_t& temp, const amrex::Real& rho, | ||
| const number_t& abar, const number_t& zbar){ | ||
| // eq. 18.86 | ||
|
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| number_t T8 = temp * 1.0e-8_rt; | ||
| return 0.76e0_rt * (amrex::Math::powi<2>(zbar)/abar) * amrex::Math::powi<6>(T8); | ||
| } | ||
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| template<typename number_t> | ||
| AMREX_GPU_HOST_DEVICE AMREX_INLINE | ||
| number_t kipp(const number_t& temp, const amrex::Real rho, | ||
| const number_t& abar, const number_t& zbar, amrex::Real& pair, | ||
| amrex::Real& phot, amrex::Real& plas, amrex::Real& brem){ | ||
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| if (temp < 1.0e7_rt){ | ||
| return 0.0e0_rt; | ||
| } | ||
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| // calculating individual contributions of all processes | ||
| number_t kip_pair_dual = kip_pair(temp, rho, abar, zbar); | ||
| number_t kip_phot_dual = kip_phot(temp, rho, abar, zbar); | ||
| number_t kip_plas_dual = kip_plas(temp, rho, abar, zbar); | ||
| number_t kip_brem_dual = kip_brem(temp, rho, abar, zbar); | ||
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| // extracting contributions to store in plotfile | ||
| pair = autodiff::val(kip_pair_dual); | ||
| phot = autodiff::val(kip_phot_dual); | ||
| plas = autodiff::val(kip_plas_dual); | ||
| brem = autodiff::val(kip_brem_dual); | ||
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| // total neutrino cooling rate | ||
| number_t snu = kip_pair_dual + kip_phot_dual + kip_plas_dual + kip_brem_dual; | ||
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| return snu; | ||
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| } | ||
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| template <int do_derivatives> | ||
| AMREX_GPU_HOST_DEVICE AMREX_INLINE | ||
| void kipp(const amrex::Real& temp, const amrex::Real& rho, const amrex::Real& abar, | ||
| const amrex::Real& zbar, amrex::Real& snu, amrex::Real& dsnudt, | ||
| amrex::Real& dsnudrho, amrex::Real& dsnudz, amrex::Real& dsnuda, | ||
| amrex::Real& pair, amrex::Real& phot, amrex::Real& plas, amrex::Real& brem) { | ||
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| /* | ||
| input: | ||
| temp = temperature | ||
| rho = density | ||
| abar = mean atomic weight | ||
| zbar = mean charge | ||
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| output: | ||
| snu = total neutrino cooling rate in erg/g/s | ||
| dsnudt = derivative of snu with respect to temp | ||
| dsnudz = derivative of snu with respect to zbar | ||
| dsnuda = derivative of snu with respect to abar | ||
| pair = pair annihilation contribution in erg/g/s | ||
| phot = photoneutrino contribution in erg/g/s | ||
| plas = plasma neutrino contribution in erg/g/s | ||
| brem = bremsstrahlung contribution rate in erg/g/s | ||
| */ | ||
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| // autodiff wrapper | ||
| if constexpr (do_derivatives){ | ||
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| using dual_t = autodiff::dual_array<1,3>; | ||
| dual_t temp_dual = temp; | ||
| dual_t abar_dual = abar; | ||
| dual_t zbar_dual = zbar; | ||
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| autodiff::seed_array(temp_dual, abar_dual, zbar_dual); | ||
| dual_t snu_dual = kipp(temp_dual, rho, abar_dual, zbar_dual, pair, phot, plas, brem); | ||
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| snu = autodiff::val(snu_dual); | ||
| const auto& grad = autodiff::derivative(snu_dual); | ||
| dsnudt = grad(1); | ||
| dsnudrho = 0.0e0_rt; | ||
| dsnuda = grad(2); | ||
| dsnudz = grad(3); | ||
| } else { | ||
| snu = kipp(temp, rho, abar, zbar, pair, phot, plas, brem); | ||
| dsnudt = 0.0e0_rt; | ||
| dsnudrho = 0.0e0_rt; | ||
| dsnuda = 0.0e0_rt; | ||
| dsnudz = 0.0e0_rt; | ||
| } | ||
| } | ||
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| //overloading to pass arguments in all cases | ||
| template <int do_derivatives> | ||
| AMREX_GPU_HOST_DEVICE AMREX_INLINE | ||
| void kipp(const amrex::Real temp, const amrex::Real den, | ||
| const amrex::Real abar, const amrex::Real zbar, | ||
| amrex::Real& snu, amrex::Real& dsnudt, amrex::Real& dsnudd, | ||
| amrex::Real& dsnuda, amrex::Real& dsnudz){ | ||
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| amrex::Real pair, phot, plas, brem; | ||
| kipp<do_derivatives>(temp, den, abar, zbar, snu, dsnudt, dsnudd, dsnuda, | ||
| dsnudz, pair, phot, plas, brem); | ||
| } | ||
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| #endif // KIP_NEUT_H | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| #ifndef NEUTRINO_H | ||
| #define NEUTRINO_H | ||
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| // Define available neutrino cooling methods | ||
| #define NEUTRINO_METHOD_kipp 1 | ||
| #define NEUTRINO_METHOD_sneut5 2 | ||
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| #include <AMReX_REAL.H> | ||
| #include <AMReX_Array.H> | ||
| #include <microphysics_autodiff.H> | ||
| #include <fundamental_constants.H> | ||
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| #include <kipp.H> | ||
| #include <sneut5.H> | ||
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| using namespace amrex::literals; | ||
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| #if NEUTRINO_METHOD == NEUTRINO_METHOD_kipp | ||
| const std::string neutrino_name = "kipp"; | ||
| #elif NEUTRINO_METHOD == NEUTRINO_METHOD_sneut5 | ||
| const std::string neutrino_name = "sneut5"; | ||
| #endif | ||
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| template <typename number_t> | ||
| AMREX_GPU_HOST_DEVICE AMREX_INLINE | ||
| number_t neutrino_cooling(const number_t& temp, const amrex::Real dens, | ||
| const number_t& abar, const number_t& zbar){ | ||
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| #if NEUTRINO_METHOD == NEUTRINO_METHOD_kipp | ||
| amrex::Real pair, phot, plas, brem; | ||
| return kipp(temp, dens, abar, zbar, pair, phot, plas, brem); | ||
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| #elif NEUTRINO_METHOD == NEUTRINO_METHOD_sneut5 | ||
| amrex::Real pair, phot, plas, brem; | ||
| return sneut5(temp, dens, abar, zbar, pair, phot, plas, brem); | ||
| #endif | ||
| } | ||
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| #endif // NEUTRINO_H |
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add:
to suppress unused var warnings