SyntheticTurbulence.H

Go to the documentation of this file.

#ifndef SyntheticTurbulence_H
#define SyntheticTurbulence_H
 
#include <string>
#include <cmath>
#include <memory>
 
#include "amr-wind/core/Physics.H"
#include "amr-wind/core/Field.H"
#include "amr-wind/core/vs/vector_space.H"
#include "amr-wind/CFDSim.H"
#include "AMReX_REAL.H"
 
using namespace amrex::literals;
 
namespace amr_wind {
 
namespace synth_turb {
 
struct MeanVelOp
{
    AMREX_GPU_DEVICE AMREX_FORCE_INLINE amrex::Real
    operator()(amrex::Real /* height */) const
    {
        return m_ref_vel;
    }
 
    const amrex::Real m_ref_vel;
};
 
class MeanProfile
{
public:
    explicit MeanProfile(amrex::Real ref_vel, int shear_dir = 2)
        : m_op{ref_vel}, m_ref_vel(ref_vel), m_shear_dir(shear_dir)
    {}
 
    virtual ~MeanProfile() = default;
 
    inline amrex::Real reference_velocity() const { return m_ref_vel; }
 
    inline int shear_dir() const { return m_shear_dir; }
 
    MeanVelOp device_instance() const { return m_op; }
 
private:
    MeanVelOp m_op;
 
    const amrex::Real m_ref_vel;
    const int m_shear_dir;
};
 
} // namespace synth_turb
 
struct SynthTurbData
{
    // Dimensions of the box
    vs::VectorT<int> box_dims;
 
    // Length of the boxes in each direction
    vs::Vector box_len;
 
    vs::Vector dx;
 
    // Reference point for the turbulence box. Reference is the mid-point of the
    // turbulence grid at the plane where it is injected into the CFD flow
    // field.
    vs::Vector origin;
 
    // Transformation matrix to convert from global coordinate system to local
    // coordinate system
    vs::Tensor tr_mat;
 
    // Perturbation velocities (2, ny, nz)
    amrex::Vector<amrex::Real> uvel;
    amrex::Vector<amrex::Real> vvel;
    amrex::Vector<amrex::Real> wvel;
 
    amrex::Gpu::DeviceVector<amrex::Real> uvel_d;
    amrex::Gpu::DeviceVector<amrex::Real> vvel_d;
    amrex::Gpu::DeviceVector<amrex::Real> wvel_d;
 
    // Indices of the two planes stored in the data arrays
    int ileft;
    int iright;
};
 
struct SynthTurbDeviceData
{
    // Dimensions of the box
    vs::VectorT<int> box_dims;
 
    // Length of the boxes in each direction
    vs::Vector box_len;
 
    vs::Vector dx;
 
    // Reference point for the turbulence box. Reference is the mid-point of the
    // turbulence grid at the plane where it is injected into the CFD flow
    // field.
    vs::Vector origin;
 
    // Transformation matrix to convert from global coordinate system to local
    // coordinate system
    vs::Tensor tr_mat;
 
    amrex::Real* uvel;
    amrex::Real* vvel;
    amrex::Real* wvel;
 
    // Indices of the two planes stored in the data arrays
    int ileft;
    int iright;
 
    explicit SynthTurbDeviceData(SynthTurbData& hdata)
        : box_dims(hdata.box_dims)
        , box_len(hdata.box_len)
        , dx(hdata.dx)
        , origin(hdata.origin)
        , tr_mat(hdata.tr_mat)
        , uvel(hdata.uvel_d.data())
        , vvel(hdata.vvel_d.data())
        , wvel(hdata.wvel_d.data())
        , ileft(hdata.ileft)
        , iright(hdata.iright)
    {}
};

struct InterpWeights
{
    int il, ir, jl, jr, kl, kr;
    amrex::Real xl, xr, yl, yr, zl, zr;
};

 
class SyntheticTurbulence : public Physics::Register<SyntheticTurbulence>
{
public:
    static std::string identifier() { return "SyntheticTurbulence"; }
 
    explicit SyntheticTurbulence(const CFDSim& sim);
 
    SyntheticTurbulence() = delete;
    SyntheticTurbulence(const SyntheticTurbulence&) = delete;
    SyntheticTurbulence& operator=(const SyntheticTurbulence&) = delete;
 
    ~SyntheticTurbulence() override = default;
 
    void initialize_fields(int level, const amrex::Geometry& geom) override;
 
    void post_init_actions() override {}
 
    void post_regrid_actions() override {}
 
    void pre_advance_work() override;
 
    void post_advance_work() override {}
 
    void initialize();
 
    void update();
 
    template <typename T>
    void update_impl(
        const SynthTurbDeviceData& /*turb_grid*/,
        const InterpWeights& /*weights*/,
        const T& /*velfunc*/);
 
private:
    const amr_wind::SimTime& m_time;
    const FieldRepo& m_repo;
    const amrex::AmrCore& m_mesh;
    Field& m_velocity;
    Field& m_density;
    Field& m_turb_force;
 
    // Turbulence file name
    std::string m_turb_filename;
 
    // Turbulence box data
    SynthTurbData m_turb_grid;
 
    std::unique_ptr<synth_turb::MeanProfile> m_wind_profile;
 
    std::string m_mean_wind_type{"ConstValue"};
    amrex::Real m_epsilon;
    amrex::Real m_gauss_scaling;
 
    amrex::Real m_time_offset{0.0_rt};
    // Duration of the synthetic turbulence injection. Unused if < 0
    amrex::Real m_duration{-1};
 
    bool m_is_init{true};
};
 
} // namespace amr_wind
 
#endif /* SyntheticTurbulence_H */