Other than obvious aspects such as being legible, clear, and understandable (at least in theory) are there any mainstream conventions for flowcharts in research papers? I'm talking about scientific based flowcharts which give an overview of the entire thrust of the paper.
I have noticed, for instance, that black and white two dimensional layouts are typical, while individual items may have some sort of consistency (e.g. cylinders tend to represent data-storage or datasets in a lot of papers). Is this part of a larger schema that researchers might adhere to?