Add turbocharged twin scenario and cross-platform test harness

include/FluidSim/Engine.hpp

@@ -8,11 +8,14 @@
 
 namespace fluidsim::port {
 
+class Ecu;
+
 class Crankshaft {
 public:
     float omega{400.0f * 2.0f * pi / 60.0f};
     float angle{}, previous_angle{}, inertia{0.2f};
     float friction_constant{}, friction_viscous{};
+    float friction_quadratic{}; // Nm / (rad/s)^2, dissipative windage term
     float load_torque{}, drivetrain_torque{};
     float average_power{}, average_torque{};
 
@@ -27,8 +30,10 @@ private:
 
 class EngineCylinder : public Component {
 public:
+    Ecu* ecu{}; // Optional ideal electronic fuel/ignition controller.
     float bore{0.075f}, stroke{0.068f}, rod{0.112f}, compression{11.5f};
     float intake_valve_diameter{0.030f}, exhaust_valve_diameter{0.028f};
+    int intake_valve_count{1}, exhaust_valve_count{1};
     float intake_valve_lift{0.005f}, exhaust_valve_lift{0.005f};
     float phase{};
     float spark_advance{20.0f}, wiebe_a{5.0f}, wiebe_m{2.0f}, burn_duration{60.0f}, burn_start{5.0f};
@@ -61,6 +66,9 @@ protected:
 
     float random_unit();
     static float wrap_degrees(float value, float cycle_degrees = 720.0f);
+    static bool crossed_angle(float previous, float current, float event) {
+        return current >= previous ? previous < event && current >= event : event > previous || event <= current;
+    }
     static bool crossed_window_close(float previous, float current, float open, float close);
     void update_rev_limiter(float rpm, float dt);
     void sync_ports();