From 92033815bad47f21fa3ae47cbc0a865dd852ac82 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Corentin=20Thom=C3=A9e?= <corentin.thomee@student.uliege.be>
Date: Wed, 13 Mar 2024 14:11:44 +0100
Subject: [PATCH] Handled degenrate case in Kutta
---
hspm/src/geometry.cpp | 2 +-
hspm/src/solver.cpp | 5 ++++-
python/main.py | 9 +--------
3 files changed, 6 insertions(+), 10 deletions(-)
diff --git a/hspm/src/geometry.cpp b/hspm/src/geometry.cpp
index e8ec926..efd5b93 100644
--- a/hspm/src/geometry.cpp
+++ b/hspm/src/geometry.cpp
@@ -30,7 +30,7 @@ void HSPM::generateNaca4DigitCoordinates(double camber, double camberPos, double
} else {
x_distr(i) = chord/2 * (cos(angle)+1);
}*/
- x_distr(i) = chord * pow((1 + cos((angle + M_PI) / 2)),2);
+ x_distr(i) = chord * pow((1 + cos((angle + M_PI) / 2)), 2);
}
for (size_t i=0; i<=N; i++) {
diff --git a/hspm/src/solver.cpp b/hspm/src/solver.cpp
index 4e986a9..8972040 100644
--- a/hspm/src/solver.cpp
+++ b/hspm/src/solver.cpp
@@ -34,7 +34,7 @@ void HSPM::solve()
// q = s1*tau + s2
// We need Kutta for tau
tau = this->solveOffBodyKutta();
-
+
q = s1*tau + s2;
this->computeInviscidVelocity();
@@ -84,6 +84,9 @@ double HSPM::solveOffBodyKutta() {
double _tau_terms = 2*(_a*_b + _c*_d - _e*_f - _g*_h);
double _const_terms = pow(_b,2) + pow(_d,2) - pow(_f,2) - pow(_h,2);
+ if (_tau2_terms < 1e-10)
+ return -_const_terms / _tau_terms; // If the quadratic equation is degenerate, we can solve it directly
+
// Solve the quadratic equation
double tau_ = (-_tau_terms + sqrt(pow(_tau_terms,2) - 4*_tau2_terms*_const_terms)) / (2*_tau2_terms);
diff --git a/python/main.py b/python/main.py
index 44e3b17..d8d9cd1 100644
--- a/python/main.py
+++ b/python/main.py
@@ -1,23 +1,16 @@
from utils import *
-N = 1000
-
config = {
'chord': 1,
- 'it_solver_tolerance': 1e-6,
'aoa': 2,
'naca': "0012",
- 'N': N,
+ 'N': 100,
'filename': "airfoil.dat"
}
if __name__ == "__main__":
solver = initHSPM(config)
- """for i in range(N):
- solver.imposeBlowingVelocity(i, 1)
- solver.setdStar(i, 0.1)"""
-
solver.solve()
cl = solver.cl
--
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