Digital Physics Approach to Computational Fluid Dynamics: Some Basic Theoretical Features

Chen, Hudong; Teixeira, Chris; Molvig, Kim

doi:10.1142/s0129183197000576

Cited by 194 publications

(117 citation statements)

References 14 publications

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“…The lattice Boltzmann model (LBM) can be derived from the velocity space discretization of the general Boltzmann equation, and it recovers the full unsteady Navier-Stokes equations. [11][12][13][14] The lattice Boltzmann equation can be solved in a DNS mode, where all of the turbulent scales are spatially and temporally resolved. However, for most engineering problems at high Reynolds numbers, the simulations are usually conducted in conjunction with a hybrid turbulence modeling approach where the small scales are modeled using a modified two-equations k − turbulence model and larger energy containing scales are directly resolved.…”

Section: Simulation Methodsmentioning

confidence: 99%

Numerical Simulation of Fluidic Actuators for Flow Control Applications

Vatsa

Köklü

Wygnanski

et al. 2012

6th AIAA Flow Control Conference

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Active flow control technology is finding increasing use in aerospace applications to control flow separation and improve aerodynamic performance. In this paper we examine the characteristics of a class of fluidic actuators that are being considered for active flow control applications for a variety of practical problems. Based on recent experimental work, such actuators have been found to be more efficient for controlling flow separation in terms of mass flow requirements compared to constant blowing and suction or even synthetic jet actuators. The fluidic actuators produce spanwise oscillating jets, and therefore are also known as sweeping jets. The frequency and spanwise sweeping extent depend on the geometric parameters and mass flow rate entering the actuators through the inlet section. The flow physics associated with these actuators is quite complex and not fully understood at this time. The unsteady flow generated by such actuators is simulated using the lattice Boltzmann based solver PowerFLOW R . Computed mean and standard deviation of velocity profiles generated by a family of fluidic actuators in quiescent air are compared with experimental data. Simulated results replicate the experimentally observed trends with parametric variation of geometry and inflow conditions. Nomenclature

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Section: Simulation Methodsmentioning

confidence: 99%

Numerical Simulation of Fluidic Actuators for Flow Control Applications

Vatsa

Köklü

Wygnanski

et al. 2012

6th AIAA Flow Control Conference

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“…Results are presented in physical units after conversion from "lattice" units and the proportionality constant, α, in (2) was chosen to match experimental results for each molecule (from Appendix A of [2]). There is excellent agreement between the two developed approaches and semi-empirical theory for all molecules over the allowed temperature range (nominally a factor of two in absolute units for this three-speed discrete system [9,11]). This validated the implementation of the VHS model within this new discrete computational framework.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Further background details on the application and results of the Chapman-Enskog analysis leading to the recovery of the Navier-Stokes equations for this system may be found in [11], which may be straightforwardly extended for the generalized LBM system (1) used here.…”

Section: Lattice Boltzmann Methodsmentioning

confidence: 99%

Simulation of Plane Poiseuille Flow of a Rarefied Gas with an Extended Lattice Boltzmann Method

Teixeira¹

2005

AIP Conference Proceedings

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Abstract. Several algorithmic extensions to the Lattice Boltzmann method (LBM) that permits its application to rarefied gas flows are presented. The accuracy of the new method is first demonstrated by validating the desired power-law viscosity-temperature relationship over the range of power-law exponents typically found in single component fluids. Next, the plane Poiseuille flow scenario is simulated for a series of Knudsen numbers, Kn, ranging from the continuum to the transition regimes, using a single computational framework. The reduced flow rate with the new approach is found to agree well with previously reported results for Kn < 1.

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“…Digital Physics is a hybrid of "lattice-gas" [4][5][6][7] and "lattice-Boltzmann" [3,8] methods. It solves the Boltzmann transport equation discretely on a regular cubic grid by moving and colliding statistical distributions of particles using the correct microscopic physics.…”

Section: Methodsmentioning

confidence: 99%

Simulation of Engine Internal Flows Using Digital Physics

Halliday¹,

Teixeira²,

Alexander³

1999

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Simulation des écoulements dans les moteurs avec la technique « Digital Physics » -Cet article présente la simulation des écoulements dans les conduits d'admission et dans les cylindres avec le code PowerFLOW. La technique numérique sur laquelle repose PowerFLOW, appelée « Digital Physics », est basée sur une théorie statistique de la cinétique. Elle est numériquement stable. La technique « Digital Physics » utilise un nombre élevé de mailles de calcul avec un modèle de turbulence simple procurant une indépendance du maillage et une précision élevée. De plus, la méthodologie est explicite en temps, permettant la simulation des transitoires. Des simulations d'écoulements dans les conduits d'admission et dans les cylindres sont présentées. Abstract -Simulation of Engine Internal Flows Using Digital Physics -This paper presents simulations of engine intake port and cylinder flows performed using PowerFLOW software. The numerical technique behind

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Digital Physics Approach to Computational Fluid Dynamics: Some Basic Theoretical Features

Abstract: We present an outline description of some fundamental theoretical properties in the Digital Physics lattice-gas algorithm.

Cited by 194 publications

References 14 publications

Numerical Simulation of Fluidic Actuators for Flow Control Applications

Numerical Simulation of Fluidic Actuators for Flow Control Applications

Simulation of Plane Poiseuille Flow of a Rarefied Gas with an Extended Lattice Boltzmann Method

Simulation of Engine Internal Flows Using Digital Physics

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