Open a topic vs start a topic both 'open a topic' and 'start a topic' are correct and commonly used phrases in english. Open channel flow is generally more complicated than pipe flow. Open topics is a correct and usable phrase in written english.
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You can use it to describe a situation where someone has the freedom to choose their own topic to talk or write about.
Open channels have sections varying from simple geometric shapes to irregular sections of natural streams. Open topic is correct and usable in written english. I recommend looking into the february 4th 2021, las cruces, new mexico shootout between drug dealer omar cueva & multiple law enforcement agencies as they give. A sbir/sttr proposal for any dod.
