ConsToPrimGas.cpp

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// -------------------------------------------------------//
//
// SHAMROCK code for hydrodynamics
// Copyright (c) 2021-2026 Timothée David--Cléris <tim.shamrock@proton.me>
// SPDX-License-Identifier: CeCILL Free Software License Agreement v2.1
// Shamrock is licensed under the CeCILL 2.1 License, see LICENSE for more information
//
// -------------------------------------------------------//

 
#include "shambase/assert.hpp"
#include "shambackends/kernel_call_distrib.hpp"
#include "shammath/riemann.hpp"
#include "shammodels/ramses/modules/ConsToPrimGas.hpp"
#include "shamrock/patch/PatchDataField.hpp"
#include "shamsys/NodeInstance.hpp"
 
namespace {
 
    template<class Tvec>
    struct KernelConsToPrimGas {
        using Tscal = shambase::VecComponent<Tvec>;
 
        inline static void kernel(
            const shambase::DistributedData<shamrock::PatchDataFieldSpanPointer<Tscal>> &spans_rho,
            const shambase::DistributedData<shamrock::PatchDataFieldSpanPointer<Tvec>> &spans_rhov,
            const shambase::DistributedData<shamrock::PatchDataFieldSpanPointer<Tscal>> &spans_rhoe,
 
            shambase::DistributedData<shamrock::PatchDataFieldSpanPointer<Tvec>> &spans_vel,
            shambase::DistributedData<shamrock::PatchDataFieldSpanPointer<Tscal>> &spans_P,
            const shambase::DistributedData<u32> &sizes,
            u32 block_size,
            Tscal gamma) {
 
            shambase::DistributedData<u32> cell_counts
                = sizes.map<u32>([&](u64 id, u32 block_count) {
                      u32 cell_count = block_count * block_size;
                      return cell_count;
                  });
 
            sham::distributed_data_kernel_call(
                shamsys::instance::get_compute_scheduler_ptr(),
                sham::DDMultiRef{spans_rho, spans_rhov, spans_rhoe},
                sham::DDMultiRef{spans_vel, spans_P},
                cell_counts,
                [gamma](
                    u32 i,
                    const Tscal *__restrict rho,
                    const Tvec *__restrict rhov,
                    const Tscal *__restrict rhoe,
                    Tvec *__restrict vel,
                    Tscal *__restrict P) {
                    auto conststate = shammath::ConsState<Tvec>{rho[i], rhoe[i], rhov[i]};
 
                    shammath::FluidStateAdiabatic<Tvec> adiab_fluid{.m_gamma = gamma};
                    auto prim_state = adiab_fluid.cons_to_prim(conststate);
 
                    SHAM_ASSERT(prim_state.press >= 0.0);
 
                    vel[i] = prim_state.vel;
                    P[i]   = prim_state.press;
                });
        }
    };
 
} // namespace
 
namespace shammodels::basegodunov::modules {
 
    template<class Tvec>
    void NodeConsToPrimGas<Tvec>::_impl_evaluate_internal() {
        __shamrock_stack_entry();
        auto edges = get_edges();
 
        edges.spans_rho.check_sizes(edges.sizes.indexes);
        edges.spans_rhov.check_sizes(edges.sizes.indexes);
        edges.spans_rhoe.check_sizes(edges.sizes.indexes);
 
        edges.spans_vel.ensure_sizes(edges.sizes.indexes);
        edges.spans_P.ensure_sizes(edges.sizes.indexes);
 
        KernelConsToPrimGas<Tvec>::kernel(
            edges.spans_rho.get_spans(),
            edges.spans_rhov.get_spans(),
            edges.spans_rhoe.get_spans(),
            edges.spans_vel.get_spans(),
            edges.spans_P.get_spans(),
            edges.sizes.indexes,
            block_size,
            gamma);
    }
 
    template<class Tvec>
    std::string NodeConsToPrimGas<Tvec>::_impl_get_tex() const {
        std::string tex = R"tex(
            Conservative to primitive variable (gas)
 
            \begin{align}
            {spans_vel}_i &= \frac{ {spans_rhov}_i }{ {spans_rho}_i } \\
            {spans_P}_i &= (\gamma - 1) \left( {spans_rhoe}_i - \frac{ {spans_rhov}_i^2 }{ 2 {spans_rho}_i } \right) \\
            i &\in [0,{sizes} * N_{\rm cell/block}) \\
            \gamma &= {gamma} \\
            N_{\rm cell/block} & = {block_size}
            \end{align}
        )tex";
 
        replace_edges_tex_symbols(tex);
 
        shambase::replace_all(tex, "{gamma}", sham::format("{}", gamma));
        shambase::replace_all(tex, "{block_size}", sham::format("{}", block_size));
 
        return tex;
    }
 
} // namespace shammodels::basegodunov::modules
 
template class shammodels::basegodunov::modules::NodeConsToPrimGas<f64_3>;