From 8d23a02812a2775af4de50614dc7cddf974e7c4e Mon Sep 17 00:00:00 2001
From: Cristian C Lalescu <Cristian.Lalescu@ds.mpg.de>
Date: Fri, 12 Oct 2018 14:45:24 +0200
Subject: [PATCH] add reference

---
 bfps/DNS.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/bfps/DNS.py b/bfps/DNS.py
index 94081850..660192c3 100644
--- a/bfps/DNS.py
+++ b/bfps/DNS.py
@@ -319,6 +319,9 @@ class DNS(_code):
         return None
     def compute_Reynolds_stress_invariants(
             self):
+        """
+        see Choi and Lumley, JFM v436 p59 (2001)
+        """
         Rij = self.statistics['R_ij(t)']
         Rij /= (2*self.statistics['energy(t)'][:, None, None])
         Rij[:, 0, 0] -= 1./3
-- 
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