Atomic Perception

Program crashes are often the result of bad hardware. Sometimes bad memory, or an overclocked system will cause frequent crashes. When I first started using Houdini, it crashed a lot. As I learned the software, it crashed less an less because I did not do the wrong thing as often (i.e wire up things wrong, or generate ridiculous simulation sizes). Try not to exceed your physical memory and keep an eye on the heat generated by your system.

Feel free to report your crash logs, however.

Particle separation divides the flip domain. You have a large separation and a large domain. Shrink them both.

Try setting the Constrain Iterations to 1000, on the Velum Solver. More constraints makes it behave more solid, however, Vellum is not a unified solver intended to replicate completely solid objects.