From ed1d7f067ab727ca8ce68311aa6119afa7b5ae1d Mon Sep 17 00:00:00 2001
From: andy <andy>
Date: Wed, 9 May 2012 10:19:30 +0100
Subject: [PATCH] ENH: Updated definition of series profie for rotorDiskSource

---
 .../rotorDiskSource/profileModel/series/seriesProfile.C     | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/fieldSources/basicSource/rotorDiskSource/profileModel/series/seriesProfile.C b/src/fieldSources/basicSource/rotorDiskSource/profileModel/series/seriesProfile.C
index 77dad6d371..5c8a20c108 100644
--- a/src/fieldSources/basicSource/rotorDiskSource/profileModel/series/seriesProfile.C
+++ b/src/fieldSources/basicSource/rotorDiskSource/profileModel/series/seriesProfile.C
@@ -48,7 +48,7 @@ Foam::scalar Foam::seriesProfile::evaluateDrag
 
     forAll(values, i)
     {
-        result += values[i]*cos((i + 1)*xIn);
+        result += values[i]*cos(i*xIn);
     }
 
     return result;
@@ -65,7 +65,9 @@ Foam::scalar Foam::seriesProfile::evaluateLift
 
     forAll(values, i)
     {
-        result += values[i]*sin((i + 1)*xIn);
+        // note: first contribution always zero since sin(0) = 0, but
+        // keep zero base to be consitent with drag coeffs
+        result += values[i]*sin(i*xIn);
     }
 
     return result;