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Computation Of Transonic Viscous Inviscid Interacting Flow
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Book Synopsis Computation of Transonic Viscous-Inviscid Interacting Flow by : D. L. Whitfield
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).
Book Synopsis Calculation of Unsteady Transonic Flows with Mild Separation by Viscous-inviscid Interaction by : James T. Howlett
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:
Book Synopsis Viscous-inviscid Interaction in Transonic Flow by : Laurence Byron Wigton
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).
Book Synopsis Calculation of Unsteady Transonic Flows with Mild Separation by Viscous-inviscid Interaction by : James T. Howlett
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:
Book Synopsis Calculation of Unsteady Transonic Flows with Mild Separation by Viscous-Inviscid Interaction by : National Aeronautics and Space Adm Nasa
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...
Book Synopsis Computation of Steady and Unsteady Quasi-One-Dimensional Viscous/Inviscid Interacting Internal Flows at Subsonic, Transonic, and Supersonic Mach Numbers by : National Aeronautics and Space Adm Nasa
Download or read book Computation of Steady and Unsteady Quasi-One-Dimensional Viscous/Inviscid Interacting Internal Flows at Subsonic, Transonic, and Supersonic Mach Numbers written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-11-07 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computations of viscous-inviscid interacting internal flowfields are presented for steady and unsteady quasi-one-dimensional (Q1D) test cases. The unsteady Q1D Euler equations are coupled with integral boundary-layer equations for unsteady, two-dimensional (planar or axisymmetric), turbulent flow over impermeable, adiabatic walls. The coupling methodology differs from that used in most techniques reported previously in that the above mentioned equation sets are written as a complete system and solved simultaneously; that is, the coupling is carried out directly through the equations as opposed to coupling the solutions of the different equation sets. Solutions to the coupled system of equations are obtained using both explicit and implicit numerical schemes for steady subsonic, steady transonic, and both steady and unsteady supersonic internal flowfields. Computed solutions are compared with measurements as well as Navier-Stokes and inverse boundary-layer methods. An analysis of the eigenvalues of the coefficient matrix associated with the quasi-linear form of the coupled system of equations indicates the presence of complex eigenvalues for certain flow conditions. It is concluded that although reasonable solutions can be obtained numerically, these complex eigenvalues contribute to the overall difficulty in obtaining numerical solutions to the coupled system of equations. Swafford, Timothy W. and Huddleston, David H. and Busby, Judy A. and Chesser, B. Lawrence Unspecified Center COMPUTATIONAL FLUID DYNAMICS; FLOW DISTRIBUTION; MACH NUMBER; NAVIER-STOKES EQUATION; NUMERICAL ANALYSIS; SUBSONIC FLOW; SUPERSONIC FLOW; TRANSONIC FLOW; UNSTEADY FLOW; VISCOUS FLOW; ADIABATIC CONDITIONS; AXISYMMETRIC FLOW; BOUNDARY LAYERS; EULER EQUATIONS OF MOTION; INTEGRAL EQUATIONS; INVISCID FLOW; TURBULENT FLOW; WALL TEMPERATURE...
Book Synopsis Computation of Viscous Phenomena in Unsteady Transonic Flow by : U. R. Muller
Download or read book Computation of Viscous Phenomena in Unsteady Transonic Flow written by U. R. Muller and published by . This book was released on 1992 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress in the development towards a 30 viscous-inviscid strong interaction method for computing unsteady transonic wing flow is reported. In the current version, an ADI-technique for solving the 3D unsteady Transonic Small Perturbation Equation (TSP) has been extended by incorporating an unsteady 2D integral boundary layer method and then simultaneously solving the viscous and inviscid flow equations in a stripwise fashion.
Book Synopsis Fluid Dynamics for the Study of Transonic Flow by : Heinrich J. Ramm
Download or read book Fluid Dynamics for the Study of Transonic Flow written by Heinrich J. Ramm and published by Oxford University Press. This book was released on 1990-02-01 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new book leads readers step-by-step through the complexities encountered as moving objects approach and cross the sound barrier. The problems of transonic flight were apparent with the very first experimental flights of scale-model rockets when the disastrous impact of shock waves and flow separations caused the aircraft to spin wildly out of control. Today many of these problems have been overcome, and this book offers an introduction to the transonic theory that has made possible many of these advances. The emphasis is on the most important basic approaches to the solution of transonic problems. The book also includes explanations of common pitfalls that must be avoided. An effort has been made to derive the most important equations of inviscid and viscous transonic flow in sufficient detail so that even novices may feel confident in their problem-solving ability. The use of computer approaches is reviewed, with references to the extensive literature in this area, while the critical shortcomings of an exclusive reliance on computational methods are also described. The book will be valuable to anyone who needs to acquire an understanding of transonic flow, including practicing engineers as well as students of fluid mechanics.
Book Synopsis Unsteady Viscous-Inviscid Interaction Procedures for Transonic Airfoil Flows by :
Download or read book Unsteady Viscous-Inviscid Interaction Procedures for Transonic Airfoil Flows written by and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study is concerned with the development of a computational algorithm for viscous-inviscid interactions with application to two-dimensional transonic airfoil flows. The inner viscous flow is computed by the integral method of Whitfield, while the external flow is calculated by Jameson's Euler equation code. The two flows are matched by a linearized boundary condition at the airfoil surface. Of particular interest is the use of a time-dependent boundary-layer calculation method since it has been determined that a time-dependent method is desirable for extending the interaction method to three-dimensional flows. In general, it is found that the agreement between theoretical prediction and experimental data is satisfactory for engineering calculations.
Book Synopsis Theoretical Calculation of Viscous-inviscid Transonic Flows by : Tsze C. Tai
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).
Book Synopsis An Analysis of Transonic Viscous/inviscid Interactions on Axisymmetric Bodies with Solid Strings Or Real Plumes by : Steven F. Yaros
Download or read book An Analysis of Transonic Viscous/inviscid Interactions on Axisymmetric Bodies with Solid Strings Or Real Plumes written by Steven F. Yaros and published by . This book was released on 1978 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unsteady Viscous-inviscid Interaction Procedures for Transonic Airfoil Flows by : Tracy Donegan
Download or read book Unsteady Viscous-inviscid Interaction Procedures for Transonic Airfoil Flows written by Tracy Donegan and published by . This book was released on 1984 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unsteady Viscous-Inviscid Interaction Procedures for Transonic Airfoil Flows by :
Download or read book Unsteady Viscous-Inviscid Interaction Procedures for Transonic Airfoil Flows written by and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study is concerned with the development of a computational algorithm for viscous-inviscid interactions with application to two-dimensional transonic airfoil flows. The inner viscous flow is computed by the integral method of Whitfield, while the external flow is calculated by Jameson's Euler equation code. The two flows are matched by a linearized boundary condition at the airfoil surface. Of particular interest is the use of a time-dependent boundary-layer calculation method since it has been determined that a time-dependent method is desirable for extending the interaction method to three-dimensional flows. In general, it is found that the agreement between theoretical prediction and experimental data is satisfactory for engineering calculations.
Book Synopsis Transonic Potential Flows with Viscous/inviscid Interactions by : Ing-Jer Chiou
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:
Book Synopsis Numerical Methods for the Computation of Inviscid Transonic Flows with Shock Waves by : Arthur Rizzi
Download or read book Numerical Methods for the Computation of Inviscid Transonic Flows with Shock Waves written by Arthur Rizzi and published by Springer-Verlag. This book was released on 2013-08-13 with total page 283 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)
Book Synopsis Investigation of Viscous/Inviscid Interaction in Transonic Flow Over Airfoils with Suction by : National Aeronautics and Space Administration (NASA)
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...
Book Synopsis An Improved Viscid/inviscid Interaction Procedure for Transonic Flow Over Airfoils by : R. E. Melnik
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:
