AddForcePaczynskiWiita.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 "shammodels/common/modules/AddForcePaczynskiWiita.hpp"
#include "shambackends/kernel_call_distrib.hpp"
#include "shamrock/patch/PatchDataField.hpp"
#include "shamsys/NodeInstance.hpp"
 
namespace shammodels::common::modules {
 
    template<class Tvec>
    void AddForcePaczynskiWiita<Tvec>::_impl_evaluate_internal() {
 
        __shamrock_stack_entry();
 
        auto edges = get_edges();
 
        edges.spans_positions.check_sizes(edges.sizes.indexes);
        edges.spans_accel_ext.ensure_sizes(edges.sizes.indexes);
 
        Tscal cmass = edges.central_mass.data;
        Tscal G     = edges.constant_G.data;
        Tscal c     = edges.constant_c.data;
        Tvec cpos   = edges.central_pos.data;
        Tscal rs    = 2 * G * cmass / (c * c);
 
        sham::distributed_data_kernel_call(
            shamsys::instance::get_compute_scheduler_ptr(),
            sham::DDMultiRef{edges.spans_positions.get_spans()},
            sham::DDMultiRef{edges.spans_accel_ext.get_spans()},
            edges.sizes.indexes,
            [GM = cmass * G, rs, cpos](u32 gid, const Tvec *xyz, Tvec *axyz_ext) {
                Tvec r_a     = xyz[gid] - cpos;
                Tscal abs_ra = sycl::length(r_a);
                Tscal denom  = (abs_ra - rs) * (abs_ra - rs) * abs_ra;
 
                axyz_ext[gid] += -GM * r_a / denom;
            });
    }
 
    template<class Tvec>
    inline std::string AddForcePaczynskiWiita<Tvec>::_impl_get_tex() const {
        std::string tex = R"tex(
                 Add force (Paczynski-Wiita potential)
 
                 \begin{align}
                 r_{\text{s}} &= 2 * {constant_G}* {central_mass} / {constant_c}^2\\
                 r_i &= {spans_positions}_i - {central_pos}_i\\
                 r &= \sqrt{\sum r_i^2}\\
                 {spans_accel_ext}_i &= -{constant_G} * {central_mass} * r_i / (r * (r - r_{\text{s}})^2)
                 \end{align}
             )tex";
 
        replace_edges_tex_symbols(tex);
 
        return tex;
    }
 
    template class shammodels::common::modules::AddForcePaczynskiWiita<f64_3>;
 
} // namespace shammodels::common::modules