Reply To: Non-Convex Cells in ANSYS Forte

[jcooper]

 

 

 

Control points are specified as fractional length along the bowl profile.  This can be hard to estimate visually, as the bowl profile is not straight. The bowl profile extends all the way from almost the outer radius of the geometry to the inner radius, or 0.0:

Looking at your mesh above, it looks like control point 5 should be set at 0.8 rather than 0.9.  You can try moving control point 3 to 0.36-0.4 and Control Point 2 to 0.3.  Your mesh should end up looking like the template above with no sudden bunching of nodes or change in cell size.  You want a nice, uniform element distribution so that the mesh can compress without folding them.  If elements are too small because of poor bunching, there is a risk of premature folding during mesh motion. ie: mesh folds before remesh can correct the problem.  This can also lead to small timesteps.

This may not be the cause of the spray issue, however.  If spray is not entering the domain when it should, it is possible that the Start point of the injection is set wrong.  Make sure that the Timing is set to Crank Angle ans that the Start of the injection is set relative to ATDC with correct duration and mass.  

The timestep problem can also be due to overly tight controls on Chemistry convergence.  You can reduce your absolute tolerance for Chemistry solver to 1.0e-08 if problems persist: