Investigation of turbulence production and dissipation due to isotropic and anisotropic roughness components on real surfaces
نویسندگان
چکیده
Roughness generally consists of structures that are either oriented anisotropic in directions tangential to the surface or isotropic, a superposition both components. Interactions between roughness elements exert significant influence on fluid mechanical losses. Cost-effective maintenance functionality surfaces aerodynamically relevant components such as blades requires quantitative prediction flow, which can be achieved through Reynolds-Averaged-Navier-Stokes Simulations (RANS). An established parameter used model flow is equivalent sand grain ks. By contrast, research presented here employs Direct Numerical (DNS) with Immersed Boundary Method (IBM) channel flows over anisotropic, and superimposed order investigate aerodynamic losses, for example, due turbulent production dissipation. The simulation results show does not correctly predict losses from surfaces, because reality, “angle attack” respect changes turbulence altered A non-linear relationship resistance this angle attack result local pressure gradients.
منابع مشابه
effect of seed priming and irrigation regimes on yield,yield components and quality of safflowers cultivars
این مطالعه در سال 1386-87 در آزمایشگاه و مزرعه پژوهشی دانشگاه صنعتی اصفهان به منظور تعیین مناسب ترین تیمار بذری و ارزیابی اثر پرایمینگ بر روی سه رقم گلرنگ تحت سه رژیم آبیاری انجام گرفت. برخی از مطالعات اثرات سودمند پرایمینگ بذر را بر روی گیاهان مختلف بررسی کرده اند اما در حال حاضر اطلاعات کمی در مورد خصوصیات مربوط به جوانه زنی، مراحل نموی، عملکرد و خصوصیات کمی و کیفی بذور تیمار شده ژنوتیپ های م...
study the effects of low level laser diode on no production and healing of diabetic and cortisone acetate and normal wounded sd rats
nitric oxide (no) is a small molecule synthesized by most of mammalian cells with diverse biological activities including vasodilatation, host defense and wound healing. impaired wound healing is a common occurrence among diabetics and patients receiving glucocorticoid therapy. on the other hand the application of laser in biomedical area have been increased. thus, the current studies were desi...
15 صفحه اولThermomechanical Interactions Due to Hall Current in Transversely Isotropic Thermoelastic with and Without Energy Dissipation with Two Temperatures and Rotation
The present paper is concerned with the investigation of disturbances in a homogeneous transversely isotropic thermoelastic rotating medium with two temperatures, in the presence of the combined effects of Hall currents and magnetic field due to thermomechanical sources. The formulation is applied to the thermoelasticity theories developed by Green-Naghdi Theories of Type-II and Type-III. ...
متن کاملan investigation of the impact of self monitoring on langauge teachers motivational practice and its effect on learners motivation
the central purpose of this study was to conduct a case study about the role of self monitoring in teacher’s use of motivational strategies. furthermore it focused on how these strategies affected students’ motivational behavior. although many studies have been done to investigate teachers’ motivational strategies use (cheng & d?rnyei, 2007; d?rnyei & csizer, 1998; green, 2001, guilloteaux & d?...
Inertial Range Scalings of Dissipation and Enstrophy in Isotropic Turbulence
Shiyi Chen,1,2 Katepalli R. Sreenivasan,3 and Mark Nelkin4 1IBM Research Division, T. J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598 2Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 3Mason Laboratory, Yale University, New Haven, Connecticut 06520-8286 4Physics Department, New York University, New York...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of the Global Power and Propulsion Society
سال: 2022
ISSN: ['2515-3080']
DOI: https://doi.org/10.33737/jgpps/151658