DragLift.cpp

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//=======================================================================================
// ____          ____    __    ______     __________   __      __       __        __
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//
//  This file is part of VirtualFluids. VirtualFluids is free software: you can
//  redistribute it and/or modify it under the terms of the GNU General Public
//  License as published by the Free Software Foundation, either version 3 of
//  the License, or (at your option) any later version.
//
//  VirtualFluids is distributed in the hope that it will be useful, but WITHOUT
//  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
//  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
//  for more details.
//
//  SPDX-License-Identifier: GPL-3.0-or-later
//  SPDX-FileCopyrightText: Copyright © VirtualFluids Project contributors, see AUTHORS.md in root folder
//
//=======================================================================================
 
#include "DragLift.h"
 
#include <cuda_runtime.h>
#include <helper_cuda.h>
 
#include <cstdio>
#include <fstream>
#include <sstream>
 
#include "Cuda/CudaMemoryManager.h"
#include "Parameter/Parameter.h"
#include "StringUtilities/StringUtil.h"
 
using namespace std;
 
namespace vf::gpu {
 
void calcDragLift(Parameter* para, CudaMemoryManager* cudaMemoryManager, int lev)
{
    //copy to host
    //finest Grid ... with the geometry nodes
    cudaMemoryManager->cudaCopyDragLift(lev, para->getParH(lev)->geometryBC.numberOfBCnodes);
    double dragX = 0., dragY = 0., dragZ = 0.;
    double CDX   = 0., CDY   = 0., CDZ   = 0.;
    // the calculation of the related area (A) will change, please take care 
    double delta_x_F = 0.00625; //[m]
    double A  = 2.19/(delta_x_F*delta_x_F);
 
    for (unsigned int it = 0; it < para->getParH(lev)->geometryBC.numberOfBCnodes; it++)
    {
        dragX += (double) (para->getParH(lev)->DragLiftPreProcessingInXdirection[it] - para->getParH(lev)->DragLiftPostProcessingInXdirection[it]); //Kraft da Impuls pro Zeitschritt merke: andere nennen es FD
        dragY += (double) (para->getParH(lev)->DragLiftPreProcessingInYdirection[it] - para->getParH(lev)->DragLiftPostProcessingInYdirection[it]); //Kraft da Impuls pro Zeitschritt merke: andere nennen es FD
        dragZ += (double) (para->getParH(lev)->DragLiftPreProcessingInZdirection[it] - para->getParH(lev)->DragLiftPostProcessingInZdirection[it]); //Kraft da Impuls pro Zeitschritt merke: andere nennen es FD
    }
    //calc CD
    CDX = 2.0 * dragX / (1.0 /*rho_0*/ * para->getVelocity() * para->getVelocity() * A);
    CDY = 2.0 * dragY / (1.0 /*rho_0*/ * para->getVelocity() * para->getVelocity() * A);
    CDZ = 2.0 * dragZ / (1.0 /*rho_0*/ * para->getVelocity() * para->getVelocity() * A);
    //Copy to vector x,y,z
    para->getParH(lev)->DragLiftVectorInXdirection.push_back(CDX);
    para->getParH(lev)->DragLiftVectorInYdirection.push_back(CDY);
    para->getParH(lev)->DragLiftVectorInZdirection.push_back(CDZ);
}
 
 
 
void allocDragLift(Parameter* para, CudaMemoryManager* cudaMemoryManager)
{
    //set level
    int lev = para->getMaxLevel();
    //allocation
    //finest Grid ... with the geometry nodes
    cudaMemoryManager->cudaAllocDragLift(lev, para->getParH(lev)->geometryBC.numberOfBCnodes);
    printf("\n number of elements for drag and lift = %d \n", para->getParH(lev)->geometryBC.numberOfBCnodes);
}
 
 
 
void printDragLift(Parameter* para, CudaMemoryManager* cudaMemoryManager, int timestep)
{
    //set level
    int lev = para->getMaxLevel();
    //set filename
    std::string ffname = para->getFName()+StringUtil::toString<int>(para->getMyProcessID())+"_"+StringUtil::toString<int>(timestep)+"_DragLift.txt";
    const char* fname = ffname.c_str();
    //set ofstream
    ofstream ostr;
    //open file
    ostr.open(fname);
    //fill file with data
    for (size_t i = 0; i < para->getParH(lev)->DragLiftVectorInXdirection.size(); i++)
    {
        ostr << para->getParH(lev)->DragLiftVectorInXdirection[i] << "\t" << para->getParH(lev)->DragLiftVectorInYdirection[i] << "\t" << para->getParH(lev)->DragLiftVectorInZdirection[i] << endl ;
    }
    //close file
    ostr.close();
    if (timestep == (int)para->getTimestepEnd())
    {
        cudaMemoryManager->cudaFreeDragLift(lev);
    }
}
 
}