diff --git a/openfoam2012/freeCylinderFlow/system/controlDict b/openfoam2012/freeCylinderFlow/system/controlDict
index d61a09dad9aea7eacc55c30ebdb7722448ff6347..f9af0036566a5913e48ee9ec1afff25179843373 100644
--- a/openfoam2012/freeCylinderFlow/system/controlDict
+++ b/openfoam2012/freeCylinderFlow/system/controlDict
@@ -32,6 +32,7 @@ deltaT          0.01;
 
 adjustTimeStep  yes;
 maxCo           1;  // according to some forum, this does not destroy stability but accuracy
+maxDeltaT       0.1;  // otherwise for low Reynold numbers, time step became > 1 s
 
 writeControl    runTime;