I think "no contact" sounds like a very, very good idea. Don't expect her to cooperate--if she were the cooperative type you wouldn't be in this position.
Oh, sorry, you asked for advice on how to achieve that. Block her number, block her emails/texts. If something gets through do NOT respond. If, in spite of all of that, she persists, then call your family court or the domestic violence hotline or local women's shelter (I know you're a guy but they can help with something concerning DV) and find out if you can get a protective order to prohibit her from contacting you. I know that sounds extreme but if she doesn't respect your efforts to be left alone, that might be an excellent option.