کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
522550 867834 2007 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Predicting the onset of flow unsteadiness based on global instability
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر نرم افزارهای علوم کامپیوتر
پیش نمایش صفحه اول مقاله
Predicting the onset of flow unsteadiness based on global instability
چکیده انگلیسی

Global-stability theory is used to predict the onset of flow unsteadiness based on steady solutions of the Reynolds Averaged Navier–Stokes equations. The stability problem is formulated for compressible flow at moderately-high Reynolds numbers, using a turbulence model to provide closure for the averaged Reynolds stresses. The approach provides an efficient method for predicting the occurrence of flow unsteadiness for problems of practical interests, and provides a useful indicator for the legitimate range of application of the steady-flow equations. Numerical solutions are presented based on a finite-difference approximation. The steady baseflow solution and the unsteady disturbance equations are solved using the same grid. Results are presented for the onset of vortex shedding about a circular cylinder at low Reynolds numbers, and for shock-induced transonic-buffet onset at high Reynolds numbers. The results for the onset of flow unsteadiness are in very good agreement with experiments and unsteady calculations.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Computational Physics - Volume 224, Issue 2, 10 June 2007, Pages 924–940
نویسندگان
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