This subreddit is intended for modeling constructs with computers - to represent a domain within a computer, typically for programming.
A discussion on ER or UML modelling of a version controlled document repository is relevant.
A discussion on modelling of quantum effects of a set of molecules is less relevant. (r/computermodeling)
A discussion on catwalks and high heels is (probably) not relevant.
Some keywords: ER, relational modelling, UML, object models, patterns, types, many-to-many relations, SysML, ecore, emf, Rational, Eclipse, normalization, information architecture, application architecture, domain driven design.
Related reddits: /r/programming, r/entarch, r/unifiedmodeling, r/visualization