From bd744f233c71227dbc95264285ae1d5e19818099 Mon Sep 17 00:00:00 2001
From: Mike Park <Mike.Park@NASA.gov>
Date: Mon, 4 Apr 2022 09:58:46 -0400
Subject: [PATCH] refactors mach / re scaling

---
 src/ref_phys.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/ref_phys.c b/src/ref_phys.c
index 363389d9c..9a641d494 100644
--- a/src/ref_phys.c
+++ b/src/ref_phys.c
@@ -648,8 +648,8 @@ REF_STATUS ref_phys_yplus_dist(REF_DBL mach, REF_DBL re, REF_DBL reference_t_k,
   REF_DBL mu, nu, tau_wall, u_tau;
   *yplus_dist = -1.0;
   RSS(viscosity_law(t, reference_t_k, &mu), "sutherlands");
-  tau_wall = mu * dudn;
-  u_tau = sqrt(tau_wall / rho) * sqrt(mach / re);
+  tau_wall = mu * dudn * mach / re;
+  u_tau = sqrt(tau_wall / rho);
   nu = mu / rho;
   *yplus_dist = nu / u_tau * (re / mach);
   return REF_SUCCESS;