From 66cf0a04d21ea8e8a8e397b8f71f7464f834088a Mon Sep 17 00:00:00 2001
From: HOCH PHILIPPE <philippe.hoch@gmail.com>
Date: Sat, 1 Mar 2025 18:11:23 +0100
Subject: [PATCH] Adding min max eignevalues
---
src/scheme/RusanovEulerianCompositeSolverTools.cpp | 14 ++++++++++++++
src/scheme/RusanovEulerianCompositeSolverTools.hpp | 5 +++++
2 files changed, 19 insertions(+)
diff --git a/src/scheme/RusanovEulerianCompositeSolverTools.cpp b/src/scheme/RusanovEulerianCompositeSolverTools.cpp
index ed8eb9e4c..37ec39c59 100644
--- a/src/scheme/RusanovEulerianCompositeSolverTools.cpp
+++ b/src/scheme/RusanovEulerianCompositeSolverTools.cpp
@@ -14,6 +14,20 @@ toolsCompositeSolver::EvaluateMaxEigenValueTimesNormalLengthInGivenDirection(con
return std::max(std::fabs(uscaln - c_mean) * norme_normal, std::fabs(uscaln + c_mean) * norme_normal);
}
+template <class Rd>
+std::pair<double, double>
+toolsCompositeSolver::EvaluateMinMaxEigenValueTimesNormalLengthInGivenDirection(const Rd& U_mean,
+ const double& c_mean,
+ const Rd& normal)
+{
+ const double norme_normal = l2Norm(normal);
+ Rd unit_normal = normal;
+ unit_normal *= 1. / norme_normal;
+ const double uscaln = dot(U_mean, unit_normal);
+
+ return {(uscaln - c_mean) * norme_normal, (uscaln + c_mean) * norme_normal};
+}
+
double
toolsCompositeSolver::compute_dt(const std::shared_ptr<const DiscreteFunctionVariant>& u_v,
const std::shared_ptr<const DiscreteFunctionVariant>& c_v)
diff --git a/src/scheme/RusanovEulerianCompositeSolverTools.hpp b/src/scheme/RusanovEulerianCompositeSolverTools.hpp
index adb65e480..cac0a9f35 100644
--- a/src/scheme/RusanovEulerianCompositeSolverTools.hpp
+++ b/src/scheme/RusanovEulerianCompositeSolverTools.hpp
@@ -17,6 +17,11 @@ double EvaluateMaxEigenValueTimesNormalLengthInGivenDirection( // const double
const double& c_mean,
const Rd& normal);
+std::pair<double, double> toolsCompositeSolver::EvaluateMinMaxEigenValueTimesNormalLengthInGivenDirection(
+ const Rd& U_mean,
+ const double& c_mean,
+ const Rd& normal);
+
// template<class Rpxd>
// Rpxd Flux(const double& Rho, const Rd& u, const R& E, )
--
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