A free program for Android, by Gaming-Apps.com.

If you enjoy studying water flow and liquid simulations, this Physics Sandbox app is for you. In this app, you can either use a pre-built boat and try to survive if you go on a raft trip with your boat, or you can build your own ship using 13 different individual ship parts. This app can simulate various waterbody states under various influences. Additionally, it enables you to observe the general fluid behavior and learn various concepts such as pressure and flow behavior. This app can be used to learn about raft and ship survival, water reaction to explosions, and general water flow in different situations.