[Examples] General cleanup of C++ flamespeed example
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Ray Speth
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b50ef03838
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f2b68d8c34
2 changed files with 45 additions and 71 deletions
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@ -8,10 +8,10 @@
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#include "cantera/oneD/StFlow.h"
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#include "cantera/IdealGasMix.h"
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#include "cantera/transport.h"
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#include <fstream>
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using namespace Cantera;
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using std::cout;
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using std::endl;
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using fmt::print;
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int flamespeed(double phi)
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{
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@ -20,45 +20,31 @@ int flamespeed(double phi)
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doublereal temp = 300.0; // K
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doublereal pressure = 1.0*OneAtm; //atm
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doublereal uin=0.3; //m/sec
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doublereal uin = 0.3; //m/sec
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gas.setState_TPX(temp, pressure, "CH4:1.0, O2:2.0, N2:7.52");
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size_t nsp = gas.nSpecies();
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vector_fp x(nsp, 0.0);
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vector_fp x(nsp);
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doublereal C_atoms = 1.0;
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doublereal H_atoms = 4.0;
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doublereal ax = C_atoms + H_atoms / 4.0;
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doublereal fa_stoic = 1.0 / (4.76 * ax);
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x[gas.speciesIndex("CH4")] = 1.0;
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x[gas.speciesIndex("O2")] = 0.21 / phi / fa_stoic;
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x[gas.speciesIndex("N2")] = 0.79 / phi/ fa_stoic;
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doublereal C_atoms=1.0;
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doublereal H_atoms=4.0;
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doublereal ax=C_atoms+H_atoms/4.0;
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doublereal fa_stoic=1.0/(4.76*ax);
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for (size_t k=0; k<nsp; k++) {
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if (k==gas.speciesIndex("CH4")) {
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x[k]=1.0;
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} else if (k==gas.speciesIndex("O2")) {
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x[k]=0.21/phi/fa_stoic;
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} else if (k==gas.speciesIndex("N2")) {
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x[k]=0.79/phi/fa_stoic;
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} else {
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x[k]=0.0;
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}
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}
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gas.setState_TPX(temp,pressure,x.data());
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doublereal rho_in=gas.density();
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gas.setState_TPX(temp, pressure, x.data());
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doublereal rho_in = gas.density();
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vector_fp yin(nsp);
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gas.getMassFractions(&yin[0]);
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try {
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gas.equilibrate("HP");
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} catch (CanteraError& err) {
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std::cout << err.what() << std::endl;
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}
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gas.equilibrate("HP");
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vector_fp yout(nsp);
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gas.getMassFractions(&yout[0]);
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doublereal rho_out = gas.density();
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doublereal Tad=gas.temperature();
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cout << phi<<' '<<Tad<<endl;
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doublereal Tad = gas.temperature();
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print("phi = {}, Tad = {}\n", phi, Tad);
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//============= build each domain ========================
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@ -69,11 +55,11 @@ int flamespeed(double phi)
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// create an initial grid
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int nz = 6;
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doublereal lz=0.1;
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doublereal lz = 0.1;
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vector_fp z(nz);
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doublereal dz=lz/((doublereal)(nz-1));
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for (int iz=0; iz<nz; iz++) {
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z[iz]=((doublereal)iz)*dz;
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doublereal dz = lz/((doublereal)(nz-1));
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for (int iz = 0; iz < nz; iz++) {
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z[iz] = ((doublereal)iz)*dz;
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}
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flow.setupGrid(nz, &z[0]);
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@ -112,7 +98,7 @@ int flamespeed(double phi)
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vector_fp locs{0.0, 0.3, 0.7, 1.0};
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vector_fp value;
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double uout=inlet.mdot()/rho_out;
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double uout = inlet.mdot()/rho_out;
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value = {uin, uin, uout, uout};
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flame.setInitialGuess("u",locs,value);
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value = {temp, temp, Tad, Tad};
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@ -129,10 +115,10 @@ int flamespeed(double phi)
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flame.showSolution();
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int flowdomain=1;
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double ratio=10.0;
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double slope=0.08;
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double curve=0.1;
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int flowdomain = 1;
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double ratio = 10.0;
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double slope = 0.08;
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double curve = 0.1;
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flame.setRefineCriteria(flowdomain,ratio,slope,curve);
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@ -149,58 +135,49 @@ int flamespeed(double phi)
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flame.solve(loglevel,refine_grid);
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double flameSpeed_mix = flame.value(flowdomain,flow.componentIndex("u"),0);
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cout << "Flame speed with mixture-averaged transport: " <<
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flame.value(flowdomain,flow.componentIndex("u"),0) << " m/s" << endl;
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print("Flame speed with mixture-averaged transport: {} m/s\n",
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flameSpeed_mix);
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// now switch to multicomponent transport
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flow.setTransport(*trmulti);
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flame.solve(loglevel, refine_grid);
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double flameSpeed_multi = flame.value(flowdomain,flow.componentIndex("u"),0);
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cout << "Flame speed with multicomponent transport: " <<
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flame.value(flowdomain,flow.componentIndex("u"),0) << " m/s" << endl;
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print("Flame speed with multicomponent transport: {} m/s\n",
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flameSpeed_multi);
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// now enable Soret diffusion
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flow.enableSoret(true);
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flame.solve(loglevel, refine_grid);
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double flameSpeed_full = flame.value(flowdomain,flow.componentIndex("u"),0);
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cout << "Flame speed with multicomponent transport + Soret: " <<
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flame.value(flowdomain,flow.componentIndex("u"),0) << " m/s" << endl;
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print("Flame speed with multicomponent transport + Soret: {} m/s\n",
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flameSpeed_full);
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int np=flow.nPoints();
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vector_fp zvec,Tvec,COvec,CO2vec,Uvec;
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printf("\n%9s\t%8s\t%5s\t%7s\n","z (m)", "T (K)", "U (m/s)", "Y(CO)");
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for (int n=0; n<np; n++) {
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print("\n{:9s}\t{:8s}\t{:5s}\t{:7s}\n",
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"z (m)", "T (K)", "U (m/s)", "Y(CO)");
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for (size_t n = 0; n < flow.nPoints(); n++) {
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Tvec.push_back(flame.value(flowdomain,flow.componentIndex("T"),n));
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COvec.push_back(flame.value(flowdomain,flow.componentIndex("CO"),n));
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CO2vec.push_back(flame.value(flowdomain,flow.componentIndex("CO2"),n));
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Uvec.push_back(flame.value(flowdomain,flow.componentIndex("u"),n));
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zvec.push_back(flow.grid(n));
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printf("%9.6f\t%8.3f\t%5.3f\t%7.5f\n",flow.grid(n),Tvec[n],Uvec[n],COvec[n]);
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print("{:9.6f}\t{:8.3f}\t{:5.3f}\t{:7.5f}\n",
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flow.grid(n), Tvec[n], Uvec[n], COvec[n]);
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}
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cout << endl<<"Adiabatic flame temperature from equilibrium is: "<<Tad<<endl;
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cout << "Flame speed for phi="<<phi<<" is "<<Uvec[0]<<" m/s."<<endl;
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print("\nAdiabatic flame temperature from equilibrium is: {}\n", Tad);
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print("Flame speed for phi={} is {} m/s.\n", phi, Uvec[0]);
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std::string reportFile = "flamespeed.csv";
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FILE* FP = fopen(reportFile.c_str(), "w");
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if (!FP) {
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printf("Failure to open file\n");
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exit(-1);
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std::ofstream outfile("flamespeed.csv", std::ios::trunc);
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outfile << " Grid, Temperature, Uvec, CO, CO2\n";
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for (size_t n = 0; n < flow.nPoints(); n++) {
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print(outfile, " {:11.3e}, {:11.3e}, {:11.3e}, {:11.3e}, {:11.3e}\n",
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flow.grid(n), Tvec[n], Uvec[n], COvec[n], CO2vec[n]);
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}
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fprintf(FP," Flame speed (mixture-averaged ) = %11.3e m/s\n", flameSpeed_mix);
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fprintf(FP," Flame speed (multicomponent ) = %11.3e m/s\n", flameSpeed_multi);
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fprintf(FP," Flame speed (multicomponent + Soret) = %11.3e m/s\n", flameSpeed_full);
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fprintf(FP," Grid, Temperature, Uvec, CO, CO2\n");
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for (int n = 0; n < np; n++) {
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fprintf(FP," %11.3e, %11.3e, %11.3e, %11.3e, %11.3e\n",
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flow.grid(n), Tvec[n], Uvec[n], COvec[n], CO2vec[n]);
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}
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fclose(FP);
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} catch (CanteraError& err) {
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std::cerr << err.what() << std::endl;
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std::cerr << "program terminating." << endl;
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std::cerr << "program terminating." << std::endl;
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return -1;
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}
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return 0;
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@ -209,7 +186,7 @@ int flamespeed(double phi)
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int main()
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{
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double phi;
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cout << "Enter phi: ";
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print("Enter phi: ");
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std::cin >> phi;
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return flamespeed(phi);
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}
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@ -1,6 +1,3 @@
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Flame speed (mixture-averaged ) = 3.461e-01 m/s
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Flame speed (multicomponent ) = 3.516e-01 m/s
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Flame speed (multicomponent + Soret) = 3.516e-01 m/s
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Grid, Temperature, Uvec, CO, CO2
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0.000e+00, 3.000e+02, 3.516e-01, 4.128e-11, 2.311e-12
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1.202e-03, 3.000e+02, 3.516e-01, 8.802e-10, 6.402e-11
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