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#include <pybind11/pybind11.h>
#include <pybind11/embed.h> // Added this for interpreter management
#include <pybind11/stl.h>
#include <chrono>
#include <iostream>
#include <iomanip>
#include <vector>
namespace py = pybind11;
PYBIND11_EMBEDDED_MODULE(dummy, m) {} // Needed for embedding
class FluidsTester {
private:
py::scoped_interpreter guard; // RAII management of the Python interpreter
py::module_ fluids;
public:
FluidsTester() {
try {
// The interpreter is automatically initialized by scoped_interpreter
fluids = py::module_::import("fluids");
std::cout << "✓ Successfully imported fluids\n";
std::cout << "✓ Fluids version: " << fluids.attr("__version__").cast<std::string>() << "\n";
} catch (const std::exception& e) {
std::cerr << "Error initializing Python: " << e.what() << std::endl;
throw;
}
}
void test_fluids() {
try {
// Test basic Reynolds number calculation
auto Re = fluids.attr("Reynolds")(
py::arg("V") = 2.5,
py::arg("D") = 0.1,
py::arg("rho") = 1000,
py::arg("mu") = 0.001
).cast<double>();
std::cout << "✓ Reynolds number calculation successful: " << Re << "\n";
assert(Re > 0);
// Test friction factor calculation
auto fd = fluids.attr("friction_factor")(
py::arg("Re") = 1e5,
py::arg("eD") = 0.0001
).cast<double>();
std::cout << "✓ Friction factor calculation successful: " << fd << "\n";
assert(fd > 0 && fd < 1);
std::cout << "\nAll basic tests completed successfully!\n";
} catch (const std::exception& e) {
std::cerr << "Error in fluids tests: " << e.what() << std::endl;
throw;
}
}
void test_atmosphere() {
try {
// Test ATMOSPHERE_1976 class
auto atm = fluids.attr("ATMOSPHERE_1976")(py::arg("Z") = 5000);
std::cout << "\nTesting atmosphere at 5000m elevation:\n";
std::cout << "✓ Temperature: " << std::fixed << std::setprecision(4)
<< atm.attr("T").cast<double>() << "\n";
std::cout << "✓ Pressure: " << atm.attr("P").cast<double>() << "\n";
std::cout << "✓ Density: " << std::setprecision(6)
<< atm.attr("rho").cast<double>() << "\n";
// Test derived properties
std::cout << "✓ Gravity: " << atm.attr("g").cast<double>() << "\n";
std::cout << "✓ Viscosity: " << std::scientific
<< atm.attr("mu").cast<double>() << "\n";
std::cout << "✓ Thermal conductivity: " << std::fixed
<< atm.attr("k").cast<double>() << "\n";
std::cout << "✓ Sonic velocity: " << std::setprecision(4)
<< atm.attr("v_sonic").cast<double>() << "\n";
// Test static methods
auto atm_class = fluids.attr("ATMOSPHERE_1976");
auto g_high = atm_class.attr("gravity")(py::arg("Z") = 1E5).cast<double>();
std::cout << "✓ High altitude gravity: " << std::setprecision(6)
<< g_high << "\n";
} catch (const std::exception& e) {
std::cerr << "Error in atmosphere tests: " << e.what() << std::endl;
throw;
}
}
void test_tank() {
try {
// Test basic tank creation
auto T1 = fluids.attr("TANK")(
py::arg("V") = 10,
py::arg("L_over_D") = 0.7,
py::arg("sideB") = "conical",
py::arg("horizontal") = false
);
std::cout << "\nTesting tank calculations:\n";
std::cout << "✓ Tank length: " << std::fixed << std::setprecision(6)
<< T1.attr("L").cast<double>() << "\n";
std::cout << "✓ Tank diameter: " << T1.attr("D").cast<double>() << "\n";
// Test torispherical tank
auto DIN = fluids.attr("TANK")(
py::arg("L") = 3,
py::arg("D") = 5,
py::arg("horizontal") = false,
py::arg("sideA") = "torispherical",
py::arg("sideB") = "torispherical",
py::arg("sideA_f") = 1,
py::arg("sideA_k") = 0.1,
py::arg("sideB_f") = 1,
py::arg("sideB_k") = 0.1
);
std::cout << "✓ Tank max height: " << DIN.attr("h_max").cast<double>() << "\n";
std::cout << "✓ Height at V=40: " << DIN.attr("h_from_V")(40).cast<double>() << "\n";
std::cout << "✓ Volume at h=4.1: " << std::setprecision(5)
<< DIN.attr("V_from_h")(4.1).cast<double>() << "\n";
} catch (const std::exception& e) {
std::cerr << "Error in tank tests: " << e.what() << std::endl;
throw;
}
}
void test_reynolds() {
try {
std::cout << "\nTesting Reynolds number calculations:\n";
// Test with density and viscosity
auto Re1 = fluids.attr("Reynolds")(
py::arg("V") = 2.5,
py::arg("D") = 0.25,
py::arg("rho") = 1.1613,
py::arg("mu") = 1.9E-5
).cast<double>();
std::cout << "✓ Re (with rho, mu): " << std::fixed << std::setprecision(4) << Re1 << "\n";
assert(std::abs(Re1 - 38200.6579) < 0.1);
// Test with kinematic viscosity
auto Re2 = fluids.attr("Reynolds")(
py::arg("V") = 2.5,
py::arg("D") = 0.25,
py::arg("nu") = 1.636e-05
).cast<double>();
std::cout << "✓ Re (with nu): " << Re2 << "\n";
assert(std::abs(Re2 - 38202.934) < 0.1);
} catch (const std::exception& e) {
std::cerr << "Error in Reynolds tests: " << e.what() << std::endl;
throw;
}
}
void test_psd() {
try {
std::cout << "\nTesting particle size distribution functionality:\n";
// Create vectors for discrete PSD
std::vector<double> ds = {240, 360, 450, 562.5, 703, 878, 1097, 1371, 1713,
2141, 2676, 3345, 4181, 5226, 6532};
std::vector<double> numbers = {65, 119, 232, 410, 629, 849, 990, 981, 825,
579, 297, 111, 21, 1};
// Create a discrete PSD
auto psd = fluids.attr("particle_size_distribution").attr("ParticleSizeDistribution")(
py::arg("ds") = ds,
py::arg("fractions") = numbers,
py::arg("order") = 0
);
std::cout << "✓ Created discrete PSD\n";
// Test mean sizes
auto d21 = psd.attr("mean_size")(2, 1).cast<double>();
std::cout << "✓ Size-weighted mean diameter: " << std::fixed
<< std::setprecision(4) << d21 << "\n";
assert(std::abs(d21 - 1857.788) < 0.1);
auto d10 = psd.attr("mean_size")(1, 0).cast<double>();
std::cout << "✓ Arithmetic mean diameter: " << d10 << "\n";
assert(std::abs(d10 - 1459.372) < 0.1);
// Test percentile calculations
auto d10_percentile = psd.attr("dn")(0.1).cast<double>();
auto d90_percentile = psd.attr("dn")(0.9).cast<double>();
std::cout << "✓ D10: " << d10_percentile << "\n";
std::cout << "✓ D90: " << d90_percentile << "\n";
// Test probability functions
auto pdf_val = psd.attr("pdf")(1000).cast<double>();
auto cdf_val = psd.attr("cdf")(5000).cast<double>();
std::cout << "✓ PDF at 1000: " << std::scientific << pdf_val << "\n";
std::cout << "✓ CDF at 5000: " << std::fixed << std::setprecision(6) << cdf_val << "\n";
// Test lognormal distribution
auto psd_log = fluids.attr("particle_size_distribution").attr("PSDLognormal")(
py::arg("s") = 0.5,
py::arg("d_characteristic") = 5E-6
);
std::cout << "✓ Created lognormal PSD\n";
auto vssa = psd_log.attr("vssa").cast<double>();
std::cout << "✓ Volume specific surface area: " << std::setprecision(2)
<< vssa << "\n";
auto span = psd_log.attr("dn")(0.9).cast<double>() -
psd_log.attr("dn")(0.1).cast<double>();
std::cout << "✓ Span: " << std::scientific << span << "\n";
auto ratio_7525 = (psd_log.attr("dn")(0.75).cast<double>() /
psd_log.attr("dn")(0.25).cast<double>());
std::cout << "✓ D75/D25 ratio: " << std::fixed << std::setprecision(6)
<< ratio_7525 << "\n";
} catch (const std::exception& e) {
std::cerr << "Error in PSD tests: " << e.what() << std::endl;
throw;
}
}
void benchmark_fluids() {
std::cout << "\nRunning benchmarks:\n";
// Benchmark friction factor calculation
std::cout << "\nBenchmarking friction_factor:\n";
auto start = std::chrono::high_resolution_clock::now();
for(int i = 0; i < 1000000; i++) {
fluids.attr("friction_factor")(
py::arg("Re") = 1e5,
py::arg("eD") = 0.0001
);
}
auto end = std::chrono::high_resolution_clock::now();
auto duration = std::chrono::duration_cast<std::chrono::microseconds>(end - start);
std::cout << "Time for 1e6 friction_factor calls: "
<< duration.count() << " microseconds\n";
std::cout << "Average time per call: "
<< duration.count() / 1000000.0 << " microseconds\n";
// Benchmark tank creation
std::cout << "\nBenchmarking TANK creation:\n";
start = std::chrono::high_resolution_clock::now();
for(int i = 0; i < 1000; i++) {
fluids.attr("TANK")(
py::arg("L") = 3,
py::arg("D") = 5,
py::arg("horizontal") = false,
py::arg("sideA") = "torispherical",
py::arg("sideB") = "torispherical",
py::arg("sideA_f") = 1,
py::arg("sideA_k") = 0.1,
py::arg("sideB_f") = 1,
py::arg("sideB_k") = 0.1
);
}
end = std::chrono::high_resolution_clock::now();
duration = std::chrono::duration_cast<std::chrono::microseconds>(end - start);
std::cout << "Average time per tank creation: "
<< duration.count() / 1000.0 << " microseconds\n";
}
};
int main() {
try {
std::cout << "Running fluids tests from C++...\n";
FluidsTester tester;
tester.test_fluids();
tester.test_atmosphere();
tester.test_tank();
tester.test_reynolds();
tester.test_psd();
tester.benchmark_fluids();
std::cout << "\nAll tests completed!\n";
return 0;
} catch (const std::exception& e) {
std::cerr << "Fatal error: " << e.what() << std::endl;
return 1;
}
}
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