A 'grid-transparent' methodology for CFD

Peroomian, Oshin; Chakravarthy, Sukumar; Goldberg, U.

doi:10.2514/6.1997-724

Cited by 83 publications

(38 citation statements)

References 5 publications

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“…This flow solver employs an upwind total variation diminishing (TVD) finite-volume spatial discretization scheme in conjunction with a multigrid accelerated implicit time-marching procedure to solve the compressible axisymmetric form of the NavierStokes equations on unstructured triangular meshes [30,31]. A V-cycle and Gauss-Seidel smoother are employed in the multigrid convergence acceleration strategy.…”

Section: Solution Of Neutral Flow Equationsmentioning

confidence: 99%

Coupled gas and ion transport in quadrupole interfaces

Jugroot¹,

Groth²,

Thomson³

et al. 2008

J. Phys. D: Appl. Phys.

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The transport of free ions through highly under-expanded jet flows of neutral gases and in the presence of applied electric fields is investigated by continuum-based (fluid) numerical simulations. In particular, numerical results are described which are relevant to ion flows occurring in quadrupole interfaces of mass spectrometer systems. A five-moment mathematical model and parallel multi-block numerical solution procedure are developed for predicting the ion transport. The model incorporates the effects of ion-neutral collision processes and is used in conjunction with a Navier-Stokes model and flow solver for the neutral gas to examine the key influences controlling the ion motion. The effects of the neutral gas flow, electric fields (both dc and rf) and flow field geometry on ion mobility are carefully assessed. The capability of controlling the charged particle motions through a combination of directed neutral flow and applied electric field is demonstrated for these high-speed, hypersonic, jet flows. The neutral dynamics is shown to have a strong influence on the ion transport whereas the electric field imparts a more gradual effect. The combined effect of the applied (dc and rf) electric field and neutral collision processes with the dilute neutral gas results in a strong tendency for ion focusing towards the axis of symmetry, with the overall efficiency governed by the mass-to-charge ratio.

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Section: Solution Of Neutral Flow Equationsmentioning

confidence: 99%

Coupled gas and ion transport in quadrupole interfaces

Jugroot¹,

Groth²,

Thomson³

et al. 2008

J. Phys. D: Appl. Phys.

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“…A commercially available code, CFD++ (28,29), is used for the time-accurate unsteady CFD simulations. The 3-D time-dependent Reynoldsaveraged Navier-Stokes equations are solved using the following finite volume method:…”

Section: Flow Solvermentioning

confidence: 99%

Unsteady Aerodynamic Simulations of a Finned Projectile at a Supersonic Speed With Jet Interaction

Sahu¹,

Fresconi²,

Heavey³

2014

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Approved for public release; distribution is unlimited.ii REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-0188Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)June 2014 ARL-TR-6960 SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S) SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTThis report describes a computational study to understand the unsteady free-flight aerodynamics and flight dynamics of a finned projectile with jet control. Numerical simulations have been performed for this projectile with jet maneuver using an advanced coupled computational fluid dynamics (CFD)/rigid body dynamics (RBD) technique. The coupled CFD/RBD method allows time-accurate virtual fly-out simulations of projectiles and simultaneously predicts the aerodynamics and the flight dynamics in an integrated manner. The control is provided by a transient pulsed jet that is activated only once in the beginning for a fixed duration and then turned off for the remaining trajectory computation. Computed results show the actual time-dependent response of the flight vehicle and the resulting unsteady aerodynamics and flight dynamics with jet control for a variety of conditions. SUBJECT TERMScoupled fly-outs, jet interaction, pulsed jet, jet control, computational fluid dynamics iii

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“…after control maneuvers [4,5], and there is a lack of knowledge and The CFD capability used here solves the Navier-Stokes equations [6][7][8][9] and incorporates advanced boundary conditions and grid motion capabilities. The present numerical study is a big step forward and a direct extension of that research which now includes numerical simulation of the actual fight paths of the projectile using coupled CFD/RBD techniques using real-time accurate approach.…”

Section: Technical Approachmentioning

confidence: 99%

Unsteady computational fluid dynamics modeling of free-flight projectile aerodynamics

Sahu¹

2007

Computational Ballistics III

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This paper describes a new multidisciplinary computational study undertaken to model the flight trajectories and the free-flight aerodynamics of both a finned projectile at supersonic velocities and a spinning projectile at subsonic speeds with and without aerodynamic flow-control. Actual flight trajectories are computed using an advanced coupled computational fluid dynamics (CFD)/rigid body dynamics (RBD) technique. An advanced time-accurate Navier-Stokes computational technique has been used in CFD to compute the unsteady aerodynamics associated with the free-flight of the finned projectile at supersonic speeds and the spinning projectile at subsonic speeds. Computed positions and orientations of the projectile have been compared with actual data measured from free-flight tests and are found to be generally in good agreement. Predicted aerodynamics forces and moments compare well with the forces and moments used in the six degree freedom fits of the results of the same tests. Unsteady numerical results obtained from the coupled method show the flow field, the aerodynamic forces and moments, and the flight trajectories of the projectile.

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A 'grid-transparent' methodology for CFD

Cited by 83 publications

References 5 publications

Coupled gas and ion transport in quadrupole interfaces

Coupled gas and ion transport in quadrupole interfaces

Unsteady Aerodynamic Simulations of a Finned Projectile at a Supersonic Speed With Jet Interaction

Unsteady computational fluid dynamics modeling of free-flight projectile aerodynamics

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