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Numerical Investigation Of Vortex Breakdown Over A 70 Degree Delta Wing Using An Euler Code
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Book Synopsis Numerical Investigation of Vortex Breakdown Over A 70 Degree Delta Wing Using an Euler Code by : Magnus Tormalm
Download or read book Numerical Investigation of Vortex Breakdown Over A 70 Degree Delta Wing Using an Euler Code written by Magnus Tormalm and published by . This book was released on 1995 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computational Fluid Dynamics Investigation of Vortex Breakdown for a Delta Wing at High Angle of Attack by : Jacob A. Freeman
Download or read book Computational Fluid Dynamics Investigation of Vortex Breakdown for a Delta Wing at High Angle of Attack written by Jacob A. Freeman and published by . This book was released on 2003-03-01 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using the commercially available FLUENT 3-D flow field solver, this research effort investigated vortex breakdown over a delta wing at high angle of attack (a) in preparation for investigation of active control of vortex breakdown using steady, along- core blowing A flat delta-shaped half-wing with sharp leading edge and sweep angle of 600 was modeled at a 180 in a wind tunnel at Mach 0,04 and Reynolds number of 3,4 x 10(sub 5). A hybrid (combination of structured and unstructured) numerical mesh was generated to accommodate blowing ports on the wing surface. Results for cases without and with along-core blowing included comparison of various turbulence models for predicting both flow field physics and quantitative flow characteristics, FLUENT turbulence models included Spalart-Allmaras (S-A), Renormalization Group k-e, Reynolds Stress (RSM), and Large Eddy Simulation (LES), as well as comparison with laminar and inviscid models. Mesh independence was also investigated, and solutions were compared with experimentally determined results and theoretical prediction, These research results show that, excepting the LES model for which the computational mesh was insufficiently refined and which was not extensively investigated, none of the turbulence models above, as implemented with the given numerical grid, generated a solution which was suitably comparable to the experimental data. Much more work is required to find a suitable combination of numerical grid and turbulence model.
Book Synopsis Numerical Investigation Into Vortical Flow about a Delta-wing Configuration Up Ti Incidences at which Vortex Breakdown Occurs in Experiment by : J. I. Van den Berg
Download or read book Numerical Investigation Into Vortical Flow about a Delta-wing Configuration Up Ti Incidences at which Vortex Breakdown Occurs in Experiment written by J. I. Van den Berg and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NAS Technical Summaries: Numerical Aerodynamic Simulation Program, March 1991 - February 1992 by :
Download or read book NAS Technical Summaries: Numerical Aerodynamic Simulation Program, March 1991 - February 1992 written by and published by . This book was released on 1992 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Investigation Into Vortical Flow about a Delta-wing Configuration Up to Incidences at which Vortex Breakdown Occurs in Experiment by : J. I. van den Berg
Download or read book Numerical Investigation Into Vortical Flow about a Delta-wing Configuration Up to Incidences at which Vortex Breakdown Occurs in Experiment written by J. I. van den Berg and published by . This book was released on 1994 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Time Accurate Euler Calculations of Vortical Flow Over a Delta Wing in Rolling Motion by :
Download or read book Time Accurate Euler Calculations of Vortical Flow Over a Delta Wing in Rolling Motion written by and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents the results of research conducted by Alenia (Italy), Dasa (Germany), DERA (United Kingdom), NLR (The Netherlands), and DLR (Goettingen, Germany) as part of the Western European Armaments Group (WEAG) TA15 program, Common Exercise V. The WEAG TA15 program was a collaborative program concerned with the investigation of steady and unsteady vortical flows over military aircraft configurations. An important component of the program were the Common Exercises (CE), which promoted the exchange of knowledge between the participating nations and aided the development of computational methods to predict vortical flows. As the analysis of flow fields about rolling delta wings is of high interest, the last CE of this group concentrated on the numerical and experimental investigation of unsteady flow over a 65 degree swept delta wing in rolling motion at transonic speed. Guided by previous work on unsteady motions, the numerical investigation was again restricted to unsteady Euler methods. Each participant for the numerical calculations was asked to perform unsteady Euler calculations for given test cases using a mandatory grid and a given number of physical time steps per period. Numerical calculations with different unsteady Euler methods using a common grid were performed at a constant rolling rate of omega(r)=0.0762 for different angles of incidence: alpha(sub 0)=0 degrees, alpha(sub 0)=10 degrees, and alpha(sub 0)=17 degrees. The numerical results reveal that the different spatial discretizations lead to characteristic differences mainly in the magnitudes of the vortex-induced suction peaks in the unsteady pressure distributions and in the prediction of vortex breakdown. The results should finally result in the development of a data base for further code validation. (13 figures, 14 refs.).
Download or read book 91-0145 - 91-0180 written by and published by . This book was released on 1991 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 39th AIAA Aerospace Sciences Meeting and Exhibit by :
Download or read book 39th AIAA Aerospace Sciences Meeting and Exhibit written by and published by . This book was released on 2001 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental and Numerical Investigation of Vortex Flow Over a 76/60-deg Double-delta Wing by : J. E. J. Maseland
Download or read book Experimental and Numerical Investigation of Vortex Flow Over a 76/60-deg Double-delta Wing written by J. E. J. Maseland and published by . This book was released on 1992 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Digital Particle Image Velocimetry Investigation of Delta Wing Vortex Flow and Vortex Breakdown by : Jeremy David Wimer
Download or read book A Digital Particle Image Velocimetry Investigation of Delta Wing Vortex Flow and Vortex Breakdown written by Jeremy David Wimer and published by . This book was released on 2003-01-01 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vortical flow over the suction side of a 650 sweep delta wing at high angles of attack is investigated in the University of Washington water tunnel using digital particle image velocimetry (DPIV). The method is first validated and then used to qualitatively and quantitatively describe the development of the leading edge vortex (LEV) both upstream and downstream of vortex breakdown. The circulation and azimuthal velocity profile in the vortex are measured and reveal that the maximum circulation of the LEV increases nearly linearly in the downstream direction up to the point of vortex breakdown. Circulation and velocity measurements in the solid-body rotational part of the LEV core, however, reveal that once the core is formed near the apex of the wing, the circulation there remains constant until just prior to breakdown, and no further vorticity is added to the core from the shear layer. The secondary vortex is found to be the key player in separating the primary vortex core from the shear layer. This model of the flow field contradicts the generally accepted conical nature of delta wing flow. Current vortex breakdown suppression methods are analyzed in light of this new model. A numerical simulation based on the vortex filament method is also used to further the self-induction theory of vortex breakdown.
Download or read book NASA SP. written by and published by . This book was released on 1990 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Numerical Investigation of Vortex Breakdown by : M. G. Hall
Download or read book A Numerical Investigation of Vortex Breakdown written by M. G. Hall and published by . This book was released on 1966 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Investigation of Three-dimensional Vortex Breakdown by : Keith Vincent Lucas
Download or read book Numerical Investigation of Three-dimensional Vortex Breakdown written by Keith Vincent Lucas and published by . This book was released on 1997 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulation of Spiral Vortex Breakdown Above a Delta Wing by : Miguel R. Visbal
Download or read book Numerical Simulation of Spiral Vortex Breakdown Above a Delta Wing written by Miguel R. Visbal and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulation of Transient Vortex Breakdown Above a Pitching Delta Wing by :
Download or read book Numerical Simulation of Transient Vortex Breakdown Above a Pitching Delta Wing written by and published by . This book was released on 1994 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational results are presented for transient vortex breakdown above a delta wing subject to a pitch-and-hold maneuver to high angle of attack. The flows are simulated by solving the full three-dimensional Navier-Stokes equations on a moving grid using the implicit Beam-Warming algorithm. An assessment of the effects of numerical resolution, and favorable comparison with experimental data suggest the computational approach captures the basic dynamics of this transient breakdown. The pressure gradient along the vortex axis is found to play a dominant role in the initiation of breakdown. A description of the three-dimensional instantaneous structure of the flow field is provided for the first time using critical-point theory. The reversed-flow region in the vortex core is associated with pairs of opposite spiral/saddle critical points. At its onset, the vortex breakdown is fairly axisymmetric; however, as it proceeds upstream and a stronger transition takes place along the axis, asymmetric effects become important and result in the formation of a bubble-type breakdown. This bubble structure is open and contains within itself a pair of stagnation points which are diametrically opposed and which rotate in the same sense as the base flow. Vortex breakdown, Delta wings, Unsteady aerodynamics, Computational fluid dynamics.
Book Synopsis Computation of Vortex Breakdown on Delta Wings Using Euler Equation with Embedded Navier-Stokes Regions by : Osama A. Kandil
Download or read book Computation of Vortex Breakdown on Delta Wings Using Euler Equation with Embedded Navier-Stokes Regions written by Osama A. Kandil and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of Vortex Breakdown Over a Delta Wing with Consideration of Control by Fluid Injection by :
Download or read book Experimental Investigation of Vortex Breakdown Over a Delta Wing with Consideration of Control by Fluid Injection written by and published by . This book was released on 2003 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
