What is the geometry engine in ANSYS?
The insides of the geometry engine in ANSYS have evolved to be a bit complex. Someone from ANSYS, Inc. development may know the details but the rumor is that there are two geometry kernels: a home grown NURBS kernel and a purchased kernel called XOX. Both are NURBS based b-rep solid modeling kernels. XOX the company no longer exists. Return to Top 21. What can I do about Boolean operation failures? The first trick to Boolean operations is to understand the BTOL command. The value of BTOL is the “point coincidence” value for Boolean operations. What this means is that when you add, glue or subtract areas or a line, the geometry engine considers any two points to be identical if they are within the BTOL value. If you have sloppy geometry you may want to increase this value. If you have a lot of Boolean operations you may want to start with it smaller to create tighter geometry. The use of BTOL is a bit of an art and the best way to get a feel for it is to try it out on your models. • Som
