کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10431450 910213 2015 18 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Computational fluid dynamics vs. inverse dynamics methods to determine passive drag in two breaststroke glide positions
ترجمه فارسی عنوان
دینامیک سیالات محاسباتی در مقابل روشهای دینامیکی معکوس برای تعیین کشش غیرفعال در دو موقعیت شیبدار بریستروت
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی پزشکی
چکیده انگلیسی
Computational fluid dynamics (CFD) plays an important role to quantify, understand and “observe” the water movements around the human body and its effects on drag (D). We aimed to investigate the flow effects around the swimmer and to compare the drag and drag coefficient (CD) values obtained from experiments (using cable velocimetry in a swimming pool) with those of CFD simulations for the two ventral gliding positions assumed during the breaststroke underwater cycle (with shoulders flexed and upper limbs extended above the head-GP1; with shoulders in neutral position and upper limbs extended along the trunk-GP2). Six well-trained breaststroke male swimmers (with reasonable homogeneity of body characteristics) participated in the experimental tests; afterwards a 3D swimmer model was created to fit within the limits of the sample body size profile. The standard k-ε turbulent model was used to simulate the fluid flow around the swimmer model. Velocity ranged from 1.30 to 1.70 m/s for GP1 and 1.10 to 1.50 m/s for GP2. Values found for GP1 and GP2 were lower for CFD than experimental ones. Nevertheless, both CFD and experimental drag/drag coefficient values displayed a tendency to jointly increase/decrease with velocity, except for GP2 CD where CFD and experimental values display opposite tendencies. Results suggest that CFD values obtained by single model approaches should be considered with caution due to small body shape and dimension differences to real swimmers. For better accuracy of CFD studies, realistic individual 3D models of swimmers are required, and specific kinematics respected.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Biomechanics - Volume 48, Issue 10, 16 July 2015, Pages 2221-2226
نویسندگان
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