dear developers , I'm doing a rotator-stator type of simulation using Pn-Pn method (lx1=8 lxd=12 ). Annular mesh has been created using genbox (box file is attached). Inner radius is considered as the hub and outer radius is the case (or the sidewalls of the disk ). I use following settings in rea file 3 p27 TORDER 20.00000 p93 Number of prev pressure solns saved 5.000000 p94 start projecting vel. after p94 step 5.000000 p95 start projecting pr after p95 step 4.000000 p99 dealiasing:if <0 disable 1.000000 p101 No. of additional filter modes 5.000000E-02 p103 weight of stabilizing filter (.01) Hub and rotor (z=0) rotating in a constant angular velocity. Stator (z=0.2) and side walls are stationary. singularities among rotor and stationary components are resolved using a method which is very similar to vortex example (using an exponential ramp instead of a polynomial ramp) . After 3000-4000 iterations , CFL number reached around 0.48 and I got following warning L1/L2 DIV(V) : -1.6903E-16 1.0198E-01 L1/L2 QTL : 0.0000E+00 0.0000E+00 L1/L2 DIV(V)-QTL: -1.6903E-16 1.0198E-01 WARNING: DIV(V)-QTL too large! I'm not using any inlets or outlets in my simulation. I'm not sure the reason for this warning. can anybody give me a little advice regarding this situation. I can provide more details on request. Desanga