3 edition of A simple, analytic 3-dimensional downburst model based on boundary layer stagnation flow found in the catalog.
A simple, analytic 3-dimensional downburst model based on boundary layer stagnation flow
by National Aeronautics and Space Administration, Langley Research Center in Hampton, Va
Written in English
|Other titles||Simple, analytic three dimensional downburst model based on boundary layer stagnation flow|
|Statement||Rosa M. Oseguera, Roland L. Bowles.|
|Series||NASA technical memorandum -- 100632|
|Contributions||Bowles, Roland L., Langley Research Center.|
|The Physical Object|
Downbursts are recognized as a significant threat to safety of transmission towers. The difference between downburst and boundary layer wind profiles will lead to different failure modes and regions of damage of a transmission tower. To account for differences of wind profiles and failure modes, the different design wind loads are proposed, and a novel analytical framework is formulated for Cited by: 1. Boundary flow condition analysis for the three-dimensional lattice Boltzmann model 1. Ginzbourg and P. M. Adler LPTM~ Asterama 2, Avenue du Tdldport~ Chasseneuil, France (Received Jo May J, retCited by:
Chand, S. and Chui, S. (). Robustness analysis of fuzzy control systems with application to aircraft roll control. In AIM Guidance Navigation and Control Conference, A simple, analytic 3- dimensional downburst model based on boundary layer stagnation flow Cited by: 2. For research on the aerodynamic characteristics of structures undergoing the acting of the sudden-change flow, the wind tunnel experiment for simulating the sudden-change airflow was introduced in this paper. Firstly, a profile of downburst gust was simulated using an active control wind tunnel. Secondly, the approach of change-step change airflow was utilized to simulate the time history of.
A non-translating, long duration thunderstorm downburst has been simulated experimentally and numerically by modelling a spatially stationary steady flow impinging air jet. Velocity profiles were shown to compare well with an upper-bound of velocity measurements reported for full-scale microbursts. Velocity speed-up over a range of topographic features in simulated downburst flow was also. THREE DIMENSIONAL BOUNDARY LAYER TRANSITION ANALYSIS IN SUPERSONIC FLOW USING A NAVIER-STOKES CODE (NS) analysis are summarized in section 2. The results of transition analysis on the sharp cone, the nose cone, and the natural laminar flow wing of the experimental airplane are described in section 3, 4 and 5 respectively.
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A simple downburst model has been developed for use in batch and real- time piloted simulation studies of guidance strategies for terminal area transport aircraft operations in wind shear conditions.
The model represents an axisymmetric stagnation point flow, based on velocity profilesFile Size: KB. Simple, analytic three dimensional downburst model based on boundary layer stagnation flow: Responsibility: Rosa M.
Oseguera, Roland L. Bowles. The model represents an axisymmetric stagnation point flow, based on velocity profiles from the Terminal Area Simulation System (TASS) model developed by Proctor and satisfies the mass Author: Roland L. Bowles and Rosa M.
Oseguera. A Simple, Analytic 3-Dimensional Downb,rst Model Based on Boundary Layer Stagnation Flow. NASA TM, Jttly Join ResearchGate to find the people and research you need to Author: Dan Vicroy. Wind load on a structure is usually investigated in turbulent boundary layer flow simulated in a boundary layer wind tunnel.
However, the strong wind that causes damages on structures is usually transient wind, for instance, downburst wind, whose statistics are different with the general atmospheric boundary : S.
Cao, Y. Zhao, H. Ozono, Y. Tamura, A. Kareem, Z. Duan. Oseguera RM, Bowles RL () A simple analytic 3-dimensional downburst model based on boundary layer stagnation flow. NASA Technical Memorandum Google Scholar Pagon WW (, ) Aerodynamics and the civil : G. Solari.
A Simple, Analytics 3-dimensional Downburst Model Based on Boundary Layer Stagnation Flow; Technical Report NASATM; The National Aeronautics and Space Administration Langley Research Center: Hampton, VA, USA, Cited by: 2.
The model could also be used as a basis for the inflow conditions for computational fluid dynamics studies of downburst wind flow around buildings. Currently it has been implemented as an EXCEL spreadsheet file, and as a FORTRAN by: The original OBV model (30 and 35) considers the boundary layer effects by shaping functions only and the development of boundary layer is regarded as a linear variation.
In this paper, a deterministic–stochastic hybrid model of downbursts is presented. In this model, downburst winds are the summation of a deterministic mean and a stochastic fluctuation. Wood’s velocity profile for the vertical profile and Holmes’ empirical model for the time function are utilized to model the mean by: A Simple, Analytic 3-Dimensional Downburst Model Based on Boundary Layer Stagnation Flow; National Aeronautics and Space Administration, Langley Research Center: Hampton, VA, USA, [Google Scholar] Vicroy, : Martin Skote, Tze Siang Sim, Narasimalu Srikanth.
A modified version of an analytical model of downburst winds is considered. The physical simulator presented in this study is the Wind Engineering, Energy and Environment (WindEEE) Dome at.
A Simple Analytics 3-dimensional Downburst Model Based on Boundary Layer Stagnation Flow Axisymmetric Microburst Model for Downdraft Estimation Physical and. Oseguera R M，Bowles R L．A simple analytic 3-dimensional downburst model based on boundary layer stagnation flow[R]．Washington D.C.：NASA Technical Memorandum ，． 被如下文章引用： TITLE: 下击暴流作用下输电铁塔荷载取值及承载性能分析; AUTHORS: 杨风利, 张宏杰, 杨靖波.
Request PDF | Impinging jet simulation of stationary downburst flow over topography | A non-translating, long duration thunderstorm downburst has been. Oseguera and R. Bowles, “ A simple, analytic 3-dimensional downburst model based on boundary layer stagnation flow,” Technical Report NASATM (NASA Cited by: 7.
A simple, analytic 3-dimensional downburst model based on boundary layer stagnation flow. NASA TMWashington, DC. Nonlinear estimation for flight control 13 Oseguera, R., R. Bowles and P. Robinson ().Cited by: Oseguera and R. Bowles, “ A simple, analytics 3-dimensional downburst model based on boundary layer stagnation flow,” Technical Report No.
NASATM, NASA Langley Research Center, Hampton, VA, Cited by: 5. Mathematical formulation of the problem. Consider the stagnation-point flow of an incompressible viscous fluid past a linearly shrinking sheet.
The equations of motion, in usual notation, for steady stagnation-point flow using the boundary layer approximations are. A Simple, Analytics 3-Dimensional Downburst Model Based on Boundary Layer Stagnation Flow,” NASA Langley Research Center, Hampton, Cited by: 8.
A semi-similar solution of an unsteady laminar compressible three-dimensional stagnation point boundary layer flow with massive blowing has been obtai Cited by: 5. Oseguera RM, Bowles RL () A simple analytic 3-dimensional downburst model based on boundary layer stagnation flow, NASA Technical Memorandum National Aeronautics and Space Administration, Washington Google Scholar Powell MD, Vickery PJ, Reinhold TA () Reduced drag coefficient for high wind speeds in tropical by: 2.Abstract: Downburst is a kind of strong wind that resulted from the flow downdraft in thunderstorm, which could assert the most serious destruction in the zone nearby ground.
Researches on downburst usually focusing on modeling and calculations of downburst wind profiles while the proposed nondimensional empirical models Author: Hui Xue Dang, Feng Li Yang, Jing Bo Yang.