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Add unit test for railbutton drag when velocity is 0

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This commit is contained in:
JoePfeiffer 2023-03-18 10:49:26 -06:00
parent 206603e865
commit c3e87bb138
1 changed files with 15 additions and 2 deletions
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17
core/test/net/sf/openrocket/aerodynamics/BarrowmanCalculatorTest.java
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@ -26,6 +26,7 @@ import net.sf.openrocket.rocketcomponent.Transition;
import net.sf.openrocket.rocketcomponent.TrapezoidFinSet; import net.sf.openrocket.rocketcomponent.TrapezoidFinSet;
import net.sf.openrocket.startup.Application; import net.sf.openrocket.startup.Application;
import net.sf.openrocket.util.Coordinate; import net.sf.openrocket.util.Coordinate;
import net.sf.openrocket.util.MathUtil;
import net.sf.openrocket.util.TestRockets; import net.sf.openrocket.util.TestRockets;
public class BarrowmanCalculatorTest { public class BarrowmanCalculatorTest {
@ -499,7 +500,8 @@ public class BarrowmanCalculatorTest {
} }
/** /**
* Tests railbutton drag. Really is testing instancing more than actual drag calculations * Tests railbutton drag. Really is testing instancing more than actual drag calculations, and making
* sure we don't divide by 0 when not moving
*/ */
@Test @Test
public void testRailButtonDrag() { public void testRailButtonDrag() {
@ -519,6 +521,8 @@ public class BarrowmanCalculatorTest {
final FlightConfiguration config = rocket.getSelectedConfiguration(); final FlightConfiguration config = rocket.getSelectedConfiguration();
final FlightConditions conditions = new FlightConditions(config); final FlightConditions conditions = new FlightConditions(config);
final BarrowmanCalculator calc = new BarrowmanCalculator(); final BarrowmanCalculator calc = new BarrowmanCalculator();
// part 1: instancing
// Put two individual railbuttons and get their CD // Put two individual railbuttons and get their CD
final RailButton button1 = new RailButton(); final RailButton button1 = new RailButton();
@ -548,7 +552,16 @@ public class BarrowmanCalculatorTest {
final double pairCD = pairForces.getCD(); final double pairCD = pairForces.getCD();
assertEquals("two individual railbuttons should have same CD as a pair", individualCD, pairCD, EPSILON); assertEquals("two individual railbuttons should have same CD as a pair", individualCD, pairCD, EPSILON);
// part 2: test at Mach 0
conditions.setMach(MathUtil.EPSILON);
final AerodynamicForces epsForces = calc.getAerodynamicForces(config, conditions, warnings);
final double epsCD = epsForces.getCD();
conditions.setMach(0);
final AerodynamicForces zeroForces = calc.getAerodynamicForces(config, conditions, warnings);
final double zeroCD = zeroForces.getCD();
assertEquals("drag at mach 0 should equal drag at mach MathUtil.EPSILON", epsCD, zeroCD, EPSILON);
} }
} }