collapse.hpp

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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
//
// -------------------------------------------------------//
 
#pragma once
 
#include "shambackends/math.hpp"
#include "shammath/matrix.hpp"
#include "shamunits/Constants.hpp"
#include "shamunits/UnitSystem.hpp"
 
namespace shamphys {
 
    template<class T>
    T free_fall_time(T rho, T G) {
        return sycl::sqrt(3 * shamunits::pi<T> / (32 * G * rho));
    }
 
    template<class T>
    T free_fall_time(T rho, const shamunits::UnitSystem<T> usys = {}) {
        return free_fall_time(rho, shamunits::Constants{usys}.G());
    }
 
} // namespace shamphys