calculate pitching moment coefficient
Hi all,
I'm studying 3D wingbody currently to get CL,CD,CM. In my results, CL,CD is acceptable compared to reference data. (each error is less then 10%) But CM, pitching moment coefficient is very far from reference. (error is over 300%) So i doubt my process to getting CM. First, reference paper said - Reference length(mac) : 0.6m - Moment reference point : 0.45m - Moment reference y-loc : 0.023m (down) So, I set the 'reference values' in Fluent - Length : 0.6m - and velocity, area And created 'moment monitor', Moment center => x : 0.45, y : -0.023 Moment Axis => z : -1 (for left-hand direction of nose-up) Wall zones : All surfaces of wingbody. and ran simulation. Am I right? How can be getting very far CM in spite of close CL and CD? Best Regards |
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