What can i do to encourage hair growth after having huge chunks ripped out?

Whoa: I'm most concerned about what happened. If you are the victim of domestic violence -- from a partner or from a parent -- this is unacceptable and you need to do something about the situation. Call an abuse hotline. If this happened in a hazing incident a work, or an accident, you need to report it. Your hair will grow back naturally in time ; you can't speed the process.