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Author : Ing-Jer Chiou
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (53 download)
Download or read book Transonic Potential Flows with Viscous/inviscid Interactions written by Ing-Jer Chiou and published by . This book was released on 1993 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Laurence Byron Wigton
Publisher :
ISBN 13 :
Total Pages : 244 pages
Book Rating : 4.:/5 (34 download)
Download or read book Viscous-inviscid Interaction in Transonic Flow written by Laurence Byron Wigton and published by . This book was released on 1981 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this thesis is to couple an inviscid two dimensional steady transonic flow calculation with a boundary layer calculation. This interaction is especially important in transonic problems since the boundary layer has a significant effect on the inviscid portion of the flow. Here, the inviscid solution is obtained by an algorithm developed for the full potential equation by Holst and Ballhaus while the attached and separated turbulent boundary layer calculations are performed by Green's lag entrainment method. Guided by a model problem suggested by Le Balleur, a viscous-inviscid coupling algorithm is developed. Theoretical analysis indicates that it coverages rapidly for attached flows ad also performs well for separated flows. These conclusions are confirmed through a series of challenging transonic calculations involving both attached and separated flows. The coupling algorithm is remarkably stable and allows computation of coupled viscous-inviscid flows within times required to perform the inviscid calculations by themselves. (Author).
Author : Chandra S. Vemuru
Publisher :
ISBN 13 :
Total Pages : 226 pages
Book Rating : 4.:/5 (189 download)
Download or read book Investigation of Viscous/inviscid Interaction in Transonic Flow Over Airfoils with Suction written by Chandra S. Vemuru and published by . This book was released on 1986 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781723187162
Total Pages : 128 pages
Book Rating : 4.1/5 (871 download)
Download or read book Investigation of Viscous/Inviscid Interaction in Transonic Flow Over Airfoils with Suction written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-18 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: The viscous/inviscid interaction over transonic airfoils with and without suction is studied. The streamline angle at the edge of the boundary layer is used to couple the viscous and inviscid flows. The potential flow equations are solved for the inviscid flow field. In the shock region, the Euler equations are solved using the method of integral relations. For this, the potential flow solution is used as the initial and boundary conditions. An integral method is used to solve the laminar boundary-layer equations. Since both methods are integral methods, a continuous interaction is allowed between the outer inviscid flow region and the inner viscous flow region. To avoid the Goldstein singularity near the separation point the laminar boundary-layer equations are derived in an inverse form to obtain solution for the flows with small separations. The displacement thickness distribution is specified instead of the usual pressure distribution to solve the boundry-layer equations. The Euler equations are solved for the inviscid flow using the finite volume technique and the coupling is achieved by a surface transpiration model. A method is developed to apply a minimum amount of suction that is required to have an attached flow on the airfoil. The turbulent boundary layer equations are derived using the bi-logarithmic wall law for mass transfer. The results are found to be in good agreement with available experimental data and with the results of other computational methods. Vemuru, C. S. and Tiwari, S. N. Unspecified Center AIRFOILS; BOUNDARY VALUE PROBLEMS; FINITE VOLUME METHOD; SUCTION; TRANSONIC FLOW; BOUNDARY CONDITIONS; FLOW DISTRIBUTION; FLOW VELOCITY; INVISCID FLOW; LAMINAR BOUNDARY LAYER; TURBULENT BOUNDARY LAYER; VISCOUS FLOW...
Author : National Aeronautics and Space Adm Nasa
Publisher :
ISBN 13 : 9781729430842
Total Pages : 44 pages
Book Rating : 4.4/5 (38 download)
Download or read book Calculation of Unsteady Transonic Flows with Mild Separation by Viscous-Inviscid Interaction written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-11 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents a method for calculating viscous effects in two- and three-dimensional unsteady transonic flow fields. An integral boundary-layer method for turbulent viscous flow is coupled with the transonic small-disturbance potential equation in a quasi-steady manner. The viscous effects are modeled with Green's lag-entrainment equations for attached flow and an inverse boundary-layer method for flows that involve mild separation. The boundary-layer method is used stripwise to approximate three-dimensional effects. Applications are given for two-dimensional airfoils, aileron buzz, and a wing planform. Comparisons with inviscid calculations, other viscous calculation methods, and experimental data are presented. The results demonstrate that the present technique can economically and accurately calculate unsteady transonic flow fields that have viscous-inviscid interactions with mild flow separation. Howlett, James T. Langley Research Center RTOP 509-10-02-03...
Author : James T. Howlett
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (317 download)
Download or read book Calculation of Unsteady Transonic Flows with Mild Separation by Viscous-inviscid Interaction written by James T. Howlett and published by . This book was released on 1992 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. E. Melnik
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (317 download)
Download or read book An Improved Viscid/inviscid Interaction Procedure for Transonic Flow Over Airfoils written by R. E. Melnik and published by . This book was released on 1985 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Tsze C. Tai
Publisher :
ISBN 13 :
Total Pages : 58 pages
Book Rating : 4.:/5 (227 download)
Download or read book Theoretical Calculation of Viscous-inviscid Transonic Flows written by Tsze C. Tai and published by . This book was released on 1980 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current status of computational capabilities for calculating viscous-inviscid transonic flows other than the solution of Navier-Stokes equations is presented. Techniques for solving transonic inviscid flows and compressible integral boundary layer methods are reviewed, and systems for strong viscous-inviscid interactions are described. Generally, the transonic viscous-inviscid interaction is characterized by a subcritical boundary layer with a supersonic outer stream. The thickening boundary layer produces a pressure rise which causes further thickening of the boundary layer. The physical flow is best modeled by direct coupling of the viscous and inviscid systems to allow immediate interaction between the shock wave and the boundary layer. It appears that the method of integral relations for the outer inviscid flow, combined with an integral boundary layer scheme, possesses such a capability. To facilitate the computation, an hybrid approach to the transonic inviscid solution, which consists of the finite difference method for solving the overall transonic inviscid potential flow field and the method of integral relations for solving Euler's equation in the shock region, is suggested. Finally, the application of the steady two-dimensional methods to the quasi two-dimensional problem on axisymmetric stream surface of a cascade flow at transonic speeds is discussed. (Author).
Author :
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.F/5 ( download)
Download or read book An Improved Viscid/inviscid Interaction Procedure for Transonic Flow Over Airfoils written by and published by . This book was released on 1985 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : D. L. Whitfield
Publisher :
ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (228 download)
Download or read book Computation of Transonic Viscous-Inviscid Interacting Flow written by D. L. Whitfield and published by . This book was released on 1983 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transonic viscous-inviscid interaction is considered using the Euler and inverse compressible turbulent boundary-layer equations. Certain improvements in the inverse boundary-layer method are mentioned, along with experiences in using various Runge-Kutta schemes to solve the Euler equations. Numerical conditions imposed on the Euler equations at a surface for viscous-inviscid interaction using the method of equivalent sources are developed, and numerical solutions are presented and compared with experimental data to illustrate essential points. (Author).
Author :
Publisher :
ISBN 13 :
Total Pages : 84 pages
Book Rating : 4.:/5 (317 download)
Download or read book Numerical Solution of Three-dimensional Unsteady Transonic Flow Over Wings Including Inviscid/viscous Interactions written by and published by . This book was released on 1983 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : W. L. Chow
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.:/5 (227 download)
Download or read book The Viscid-Inviscid Interaction Associated with a Two-Dimensional Transonic Flow Past a Backstep written by W. L. Chow and published by . This book was released on 1975 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of viscid-inviscid interaction associated with separated flows within the transonic flow regime is examined. A flow model is developed to account for this interaction for a transonic flow past a backstep. By specifying an unknown discrete parameter which essentially describes the equivalent inviscid flow geometry within the separated flow region, the corresponding inviscid flow field is established through numerical relaxative calculations of the full potential equation. It has been found in the subsequent viscous flow calculations that the point of reattachment behaves as a saddle point singularity for the system of equation for the viscous flow within the recompression region which, in turn, provides a discriminating condition for the determination of the discrete parameter.
Author :
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (317 download)
Download or read book Simulation of Transonic Separated Airfoil Flow by Finite Difference Viscous-inviscid Interaction written by and published by . This book was released on 1984 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James T. Howlett
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (31 download)
Download or read book Calculation of Unsteady Transonic Flows with Mild Separation by Viscous-inviscid Interaction written by James T. Howlett and published by . This book was released on 1992 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Adriaan Jan Wees
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (694 download)
Download or read book A Fast and Robust Viscous-inviscid Ineraction Solver for Transonic Flow about Wing/body Configurations on the Basis of Full Potential Theory written by Adriaan Jan Wees and published by . This book was released on 1994 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Dimitry Yumashev
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (643 download)
Download or read book Viscous-inviscid Interaction in a Transonic Flow Caused by a Discontinuity in Wall Curvature written by Dimitry Yumashev and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Dimitry Yumashev
Publisher :
ISBN 13 :
Total Pages : 215 pages
Book Rating : 4.:/5 (643 download)
Download or read book Viscous-inviscid Interaction in a Transonic Flow Caused by a Discontinuity in Wall Curvature written by Dimitry Yumashev and published by . This book was released on 2010 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt:
