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Add test for CD overrides and base drag

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This commit is contained in:
JoePfeiffer 2023-03-16 22:54:29 -06:00
parent 4f4a55b8d2
commit aa014749b6
1 changed files with 70 additions and 0 deletions
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core/test/net/sf/openrocket/aerodynamics/BarrowmanCalculatorTest.java
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@ -497,4 +497,74 @@ public class BarrowmanCalculatorTest {
assertEquals("should be warning from podset airframe overlap", 1, warnings.size()); assertEquals("should be warning from podset airframe overlap", 1, warnings.size());
} }
@Test
public void testBaseDragWithOverride() {
final WarningSet warnings = new WarningSet();
final BarrowmanCalculator calc = new BarrowmanCalculator();
// get base drag of minimal rocket consisting of just a tube.
final Rocket tubeRocket = new Rocket();
final AxialStage tubeStage = new AxialStage();
tubeRocket.addChild(tubeStage);
final BodyTube tubeBodyTube = new BodyTube();
tubeStage.addChild(tubeBodyTube);
final FlightConfiguration tubeConfig = new FlightConfiguration(tubeRocket);
final FlightConditions tubeConditions = new FlightConditions(tubeConfig);
final AerodynamicForces tubeForces = calc.getAerodynamicForces(tubeConfig, tubeConditions, warnings);
final double tubeBaseCD = tubeForces.getBaseCD();
// get base CD of minimal rocket consisting of just a cone
final Rocket coneRocket = new Rocket();
final AxialStage coneStage = new AxialStage();
coneRocket.addChild(coneStage);
NoseCone coneCone = new NoseCone();
coneCone.setAftRadius(tubeBodyTube.getOuterRadius());
coneStage.addChild(coneCone);
final FlightConfiguration coneConfig = new FlightConfiguration(coneRocket);
final FlightConditions coneConditions = new FlightConditions(coneConfig);
final AerodynamicForces coneForces = calc.getAerodynamicForces(coneConfig, coneConditions, warnings);
final double coneBaseCD = coneForces.getBaseCD();
// now our test rocket, with a tube and a cone
final Rocket testRocket = new Rocket();
final AxialStage testStage = new AxialStage();
testRocket.addChild(testStage);
final BodyTube testTube = new BodyTube();
testTube.setOuterRadius(tubeBodyTube.getOuterRadius());
testStage.addChild(testTube);
final NoseCone testCone = new NoseCone();
testCone.setAftRadius(coneCone.getAftRadius());
testStage.addChild(testCone);
FlightConfiguration testConfig = new FlightConfiguration(testRocket);
FlightConditions testConditions = new FlightConditions(testConfig);
// no overrides
AerodynamicForces testForces = calc.getAerodynamicForces(testConfig, testConditions, warnings);
assertEquals("base CD should be base CD of tube plus base CD of cone", tubeBaseCD + coneBaseCD, testForces.getBaseCD(), EPSILON);
// override tube CD
testTube.setCDOverridden(true);
testTube.setOverrideCD(0);
testForces = calc.getAerodynamicForces(testConfig, testConditions, warnings);
assertEquals("base CD should be base CD of cone", coneBaseCD, testForces.getBaseCD(), EPSILON);
// override cone CD
testCone.setCDOverridden(true);
testCone.setOverrideCD(0);
testForces = calc.getAerodynamicForces(testConfig, testConditions, warnings);
assertEquals("base CD should be 0", 0.0, testForces.getBaseCD(), EPSILON);
// and turn off tube override
testTube.setCDOverridden(false);
testForces = calc.getAerodynamicForces(testConfig, testConditions, warnings);
assertEquals("base CD should be base CD of tube", tubeBaseCD, testForces.getBaseCD(), EPSILON);
}
} }