Welcome to Houdini world my friend :wink:
You have too many way for this purpose , You can use
Viscosity Attribute like uploaded project , Or you can put Flip particles inside of your collision object , Then extract your collision mesh from specify point , something exactly like “Oily Lion” project that I made for my VFX Demo Reel :idea:
Watch “Oily Lion” project on my VFX Demo Reel from below link (in time 1:18"):
http://www.jkcompany.org/JK_DemoReelsAlbum.html [jkcompany.org]And I made a simple project about
Viscosity method in the Attached File :wink: