hongshaorou/openrocket
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Adjust calculation of axial length (for fineness friction adjustment) to be from tip of rocket to aft-most axial component instead of simply adding all axial component lengths together. Necessary so body tubes on pods don't add to length incorrectly.

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TODO:  I suspect we actually ought to be calculating the fineness of the tubes on each pod and adjusting friction on each of them accordinging.
This commit is contained in:
JoePfeiffer 2020-03-25 14:42:37 -06:00
parent 5e5ce3d06e
commit 9845decb20
1 changed files with 11 additions and 7 deletions
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18
core/src/net/sf/openrocket/aerodynamics/BarrowmanCalculator.java
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@ -388,7 +388,7 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
double finFriction = 0;
double bodyFriction = 0;
double maxR = 0, len = 0;
double maxR = 0, minX = Double.MAX_VALUE, maxX = 0;
double[] roughnessLimited = new double[Finish.values().length];
Arrays.fill(roughnessLimited, Double.NaN);
@ -453,11 +453,15 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
map.get(c).setFrictionCD(componentCf * s.getComponentWetArea()
/ conditions.getRefArea());
}
double r = Math.max(s.getForeRadius(), s.getAftRadius());
if (r > maxR)
maxR = r;
len += c.getLength();
final double componentMinX = context.getLocation().x;
minX = Math.min(minX, componentMinX);
final double componentMaxX = componentMinX + c.getLength();
maxX = Math.max(maxX, componentMaxX);
final double componentMaxR = Math.max(s.getForeRadius(), s.getAftRadius());
maxR = Math.max(maxR, componentMaxR);
} else if (c instanceof FinSet) {
@ -477,7 +481,7 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
}
// fB may be POSITIVE_INFINITY, but that's ok for us
double fB = (len + 0.0001) / maxR;
double fB = (maxX - minX + 0.0001) / maxR;
double correction = (1 + 1.0 / (2 * fB));
// Correct body data in map