Blender Smoke credits:

Wavelet Turbulence for Fluid Simulation
Copyright 2008 Theodore Kim and Nils Thuerey 
Paper + Website: http://www.cs.cornell.edu/~tedkim/WTURB/

source/blender/blenkernel/intern/smoke.c

@@ -911,6 +911,7 @@ void smokeModifier_do(SmokeModifierData *smd, Scene *scene, Object *ob, DerivedM
 									
 								obstacles[index] = 1;
 
+								// for moving gobstacles
 								/*
 								const LbmFloat maxVelVal = 0.1666;
 								const LbmFloat maxusqr = maxVelVal*maxVelVal*3. *1.5;