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Friday, July 24, 2020 | History

3 edition of Numerical simulation of unsteady rotational flow over propfan configurations found in the catalog.

Numerical simulation of unsteady rotational flow over propfan configurations

Numerical simulation of unsteady rotational flow over propfan configurations

semi-annual status report for the period May 1, 1989 - November 30, 1989

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  • 28 Currently reading

Published by National Aeronautics and Space Administration in [Washington, DC .
Written in English

    Subjects:
  • Aerodynamics.

  • Edition Notes

    Statementprepared by R. Srivastava, L.N. Sankar.
    SeriesNASA-CR -- 186037., NASA contractor report -- NASA CR-186037.
    ContributionsSankar, Lakshmi N., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15277906M

      Large Eddy Simulations are carried out to analyze flow past flat plate in different configurations and inclinations. A thin flat plate is considered at three inclination angles (α = 30°, 60° and 90°) and three aspect ratios (AR = , 2 and 5). The Reynolds number based on the free stream velocity and chord length of the plate at different inclination angles varies betw to , B. Grossman and R. E. Melnik, The numerical computation of the transonic flow over two-element airfoil systems, Proceedings of the Fifth International Conference on Numerical Methods in Fluid Dynamics June 28 – July 2, Twente University, Enschede, /X_, (), ().

    Numerical Simulation of Wings in Steady and Unsteady Ground Effects C Simulation of Transonic Viscous Flow over a Fighter-Like Configuration Including Inlet C Noise Prediction of a Counter-Rotation Propfan C Measurements of Propeller Noise in .   This flow configuration is determined by non-dimensional parameters, such as forcing frequency S f (= fd/U 0), rotational amplitude V r (= dω/2U 0) and Reynolds number Re (= dU 0 /ν), where d is the diameter of the circular cylinder, f is the oscillation frequency, U 0 is the free-stream velocity, ν is the kinematic viscosity of the fluid.

    A numerical study is presented on the problem of 2D natural convection in a differentially heated cavity. The equations governing this unsteady flow phenomenon were solved using the vorticity-stream function formulation of the Navier-Stokes equations and heat. The results obtained are compared with the results of the literature and make it possible to validate this approach. This paper details immersed boundary method (IBM) to facilitate numerical investigation of the laminar forced fluid flow over a forward-backward facing step through a 2D channel by treating step as an immersed boundary (IB). The present numerical method is based on a finite volume approach on a staggered grid together with a fractional step method.


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Numerical simulation of unsteady rotational flow over propfan configurations Download PDF EPUB FB2

NUMERICAL SIMULATION OF UNSTEADY ROTATIONAL FLOW OVER PROPFAN CONFIGURATIONS,/j Z NASA GRANT No. NAG SEMI-ANNUAL STATUS REPORT For the Period May 1,g -Novem Submitted to NASA LEWIS RESEARCH CENTER CLEVELAND, OHIO Attn: George Stefko Chief, Structural Dynamics Branch Prepared By R.

Numerical simulation of unsteady rotational flow over propfan configurations: semi-annual status report for the period May 1, - Novem Author: R Srivastava ; L N Sankar ; United States. SIMULATION OF UNSTEADY ROTATIONAL FLOW OVER PROPFAN CONFIGURATION NASA GRANT No.

NAG I //t/ FINAL REPORT for the period JUNE - NOVEM submitted to NASA LEWIS RESEARCH CENTER CLEVELAND, OHIO i m J Attn: Mr. Stefko Project Monitor Prepared by: Rakesh Srivastava Post Doctoral Fellow L.

Sankar Associate Professor. Get this from a library. Simulation of unsteady rotational flow over propfan configuration.

[Rakesh Srivastava; L N Sankar; United States. National Aeronautics and Space Administration.]. NUMERICAL SIMULATION OF UNSTEADY- FLOW PROCESSES IN WAVE ROTORS M.

Frackowiak Warsaw University of Technology Institute of Aeronautics and Applied Mechanics 24 Nowowiejska Str. Warsaw, Poland Florin Iancu Michigan State University Dept. of Mechanical Engineering Engineering Building East Lansing, Michigan Phone: +1 () counter-rotating configurations for fans, propellers, pumps and turbines, etc.

Numerical approaches were employed [6, 7] to study the flow field in a counter-rotating open rotors used in propulsion systems. The complexity of the unsteady flow induced by the interactions between the. Hafez M., Ahmad J. () Numerical Simulation of Numerical simulation of unsteady rotational flow over propfan configurations book Flows.

In: Zierep J., Oertel H. (eds) Symposium Transsonicum III. International Union of Theoretical and Applied Mechanics. It was tested by simulating the unsteady flow on a prop fan configuration with two counter-rotating rotors.

The comparison of results and performances with respect to an existing commercial flow. Tatewaki et al.: A Numerical Simulation of Unsteady Airflow in HDDs The shroud gap was set to 2 mm to observe sec-ondary flows more easily. The time step for unsteady calculation was set to ms to detect vibrations of up to 5 kHz.

The turbulence model constant was set to as the most general value. Table 2 lists the analysis conditions. THE EFFICIENT NUMERICAL SIMULATION OF UNSTEADY FLOW IN A CENTRIFUGAL COMPRESSOR STAGE EQUIPPED WITH A VANED DIFFUSER ABSTRACT The scope of this paper is to present the Computational Fluid Dynamics (CFD) transient flow simulations of a centrifugal compressor stage with cavities at design point and at off design conditions.

Numerical Simulation of Unsteady Flow to Show Self-starting of Vertical Axis Wind Turbine Using Fluent Author: Habtamu Beri and Yingxue Yao Subject: Journal of Applied Sciences Keywords: vertical axis, unsteady flow, wind energy, Wind turbine, moving mesh, mesh, simulation Created Date: 2/21/ AM.

Issued as Semi-annual status reports [nos], Report, and Final report, Project no. E Final report has title: Simulation of unsteady rotational flow over propfan configuration View full-text.

Simulation of unsteady rotational flow over propfan configuration. By Narayanamoorthy Lakshmi Sankar. Abstract. Issued as Semi-annual status reports [nos], Report, and Final report, Project no. EFinal report has title: Simulation of unsteady rotational flow over propfan configuratio.

flow simulation with a steady flow numerical solution is done to point out the necessity for taking into account unsteady effects. The comparison with experimental data is then presented in a second part for time averaged quantities, with the objective to assess the capacity of the unsteady flow simulation to reproduce the main flow features.

A fundamental study has been performed to understand the effect of unsteady forcing on turbulence statistics in channel flow with rough walls using direct numerical simulation.

Unsteady flows have been generated by applying an unsteady nonzero mean forcing in the form of time varying pressure gradient such that the amplitude of oscillations is between 19% and 26% of mean centerline velocity.

Experimental and numerical aspects of simulating unsteady flows around the X configuration Andreas Schütte1 Martin Rein2 Gebhard Höhler2 1German Aerospace Center (DLR), Institute of Aerodynamics and Flow Technology Lilienthalplatz 7, Braunschweig, Germany Email: [email protected] Compared with the 3D simulation, the 2D simulation was only the aerodynamic performance of the blade airfoil shape; support arms, torque shaft and bearing disc were not considered.

However, solving unsteady flow over 3D model would take much longer CPU time (several weeks per simulation). So 2D simulation can get a similar result. Hansing J., Sutcliffe M., Knobloch O. () Numerical simulation of the propeller flow around a four-engined aircraft in high-lift configuration.

In: Breitsamter C., Laschka B., Heinemann HJ., Hilbig R. (eds) New Results in Numerical and Experimental Fluid Mechanics IV. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol   After the validation of the second-order CBS algorithm and the computational code developed in this study, attention is now focused on the numerical simulation of flow around three equal cylinders with D = 1 in equilateral arrangements with α = 0°, 30°, 60° and ⩽ s ⩽ (i.e., s =,), where α and s are.

The unsteady RANS simulations are carried out over the whole spatial and temporal periodicity of the compressor. The main numerical setup has been fixed according to the state of the art. Second, the effect of three different time discretizations on the flow field in CREATE is discussed.

Numerical simulation of the unsteady flow over an elliptic cylinder at different orientations. H. M. Badr. Corresponding Author. A numerical method is developed for investigating the two‐dimensional unsteady viscous flow over an inclined elliptic cylinder placed in a uniform stream of infinite extent.

The direction of the free stream is.Numerical Simulation of Unsteady Flow to Show Self-starting of Vertical Axis Wind Turbine Using Fluent. Journal of Applied Sciences, DOI: /jasInvestigation of Advanced Counter-rotation Blade Configuration Concepts for High Speed Turboprop Systems: Task I-Ducted Propfan Analysis Task II-Unsteady Ducted Propfan Analysis-Final Report,” NASA Contract Rep.

NASA CR. Three-Dimensional Computational Fluid Dynamics Simulation and Numerical and Experimental Analysis of.