grillkol/FluidSimCpp
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grillkol
2026-10-23 12:43:57 +02:00
parent 7a5c77c1c8
commit 85d4fb828a
36 changed files with 805 additions and 144 deletions
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16
tests/fluid_validation.cpp
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@@ -15,8 +15,8 @@ void check(bool b, const std::string &s) {
void near(double a, double b, double tol, const char *s) {
check(std::isfinite(a) && std::abs(a - b) <= tol, s);
}
void set(Pipe1D &p, int i, float pressure, float rho, float u = 0, float air = 1) {
p.cells[i] = {rho, rho * u, pressure / pipe_gm1 + .5f * rho * u * u, air};
void set(Pipe1D &p, int i, float pressure, float rho, float u = 0, float air = 1, float fuel = 0) {
p.cells[i] = {rho, rho * u, pressure / pipe_gm1 + .5f * rho * u * u, air, fuel};
}
void lossless(Pipe1D &p) {
p.damping_multiplier = 0;
@@ -499,7 +499,8 @@ int main() {
for (int k = 0; k < 2; k++) {
lossless(p[k]);
for (int i = 0; i < 40; i++)
set(p[k], i, k ? 100000 : 120000, 1.2f, 0, k ? .9f : .1f);
set(p[k], i, k ? 100000 : 120000, 1.2f, 0, k ? .9f : .1f,
k ? .02f : .05f);
}
auto air_mass = [&] {
double sum = 0;
@@ -508,7 +509,15 @@ int main() {
sum += q.cell_mass(i) * q.cells[i].air;
return sum;
};
auto fuel_mass = [&] {
double sum = 0;
for (auto &q : p)
for (int i = 0; i < 40; i++)
sum += q.cell_mass(i) * q.cells[i].fuel;
return sum;
};
double before = air_mass();
double fuel_before = fuel_mass();
BoundarySystem b(p);
b.add_closed_end(0, true);
b.add_closed_end(1, false);
@@ -517,6 +526,7 @@ int main() {
for (int i = 0; i < 3000; i++)
solver.step(1.f / 44100);
near(air_mass(), before, before * 4e-5, "species created at shared face");
near(fuel_mass(), fuel_before, fuel_before * 4e-5, "fuel species created at shared face");
});
test("unsupported unequal junction rejected", [] {
std::vector<Pipe1D> p;