Comparison of a 3-D CFD-DSMC Solution Methodology With a Wind Tunnel Experiment

Glass, Christopher E.; Horvath, Thomas J.

doi:10.1063/1.1581580

Cited by 14 publications

(14 citation statements)

References 13 publications

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“…It has been pointed out that the latter not only reduces the statistical noise associated with the flux quantities [21,33], but also allows for a conservative formulation of the fluxes into both the domains [29]. This approach was followed, for example, in [23,24,27,34,35] for different applications.…”

Section: Introductionmentioning

confidence: 97%

Hybrid simulations of rarefied supersonic gas flows in micro-nozzles

et al. 2011

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Section: Introductionmentioning

confidence: 97%

Hybrid simulations of rarefied supersonic gas flows in micro-nozzles

et al. 2011

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“…Alternatively a discrete velocity method (DVM) 3,40 can be used to solve a kinetic model approximation of the BTE 4,31,35 . In previous works 7,21,25,44 hybrid techniques have been introduced to simulate flow fields where continuum and rarefied regimes coexist. In these methods, the more expensive approach, DSMC or DVM, is employed only where needed and is coupled with a finite-volume scheme for the NS equations used where the flow is continuum.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Models and Gas Kinetic Schemes for Hybrid Simulation of Partially Rarefied Flows

Colonia

Steijl

Barakos

2015

AIAA Atmospheric Flight Mechanics Conference

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Approaches to predict flow fields that display rarefaction effects incur a cost in computational time and memory considerably higher than methods commonly employed for continuum flows. For this reason, to simulate flow fields where continuum and rarefied regimes coexist, hybrid techniques have been introduced. In the present work analytically defined Gas-Kinetic schemes based on the Shakhov and Rykov models, for monoatomic and diatomic gas flows, respectively, are proposed and evaluated with the aim to be used in the context of hybrid simulations. This should reduce the region where more expensive methods are needed by extending the validity of the continuum formulation. Moreover, since for rarefied gas flows at high velocities it is necessary to take into account the non-equilibrium among the internal degrees of freedom, the extension of the approach to employ diatomic gas models with rotational relaxation is a mandatory first step towards realistic simulations. Compared to previous works of Xu and co-workers the presented scheme is defined directly on the basis of kinetic models which involve a Prandtl number correction. Moreover, the methods are defined fully analytically instead of making use of Taylor expansion for the evaluation of the required derivatives. The scheme has been tested for various test cases and Mach numbers proving to produce reliable predictions in agreement with other approaches for near-continuum flows. Finally, the performance of the scheme, in terms of memory and computational time, compared to discrete velocity methods makes it a compelling alternative in place of more complex methods for hybrid simulations of weakly rarefied flows.

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“…This required 200 million particles taking 18 Gbytes of core memory and it is reported that regions of the flow may still be under-resolved. 5 Thus, there is significant efficiency to be gained if the DSMC method is restricted only to that portion of the flow field where large non-equilibrium effects are felt.…”

Section: A Motivationmentioning

confidence: 99%

“…This approach is similar to the "zonally decoupled" solutions discussed earlier. [3][4][5] However, the MPC method adapts the interface locations and restricts particle regions only to that portion of the flow field where large non-equilibrium effects are felt. For the M12 case these regions include the fore-body boundary layer and only a portion of the wake.…”

Section: B Fore-body and Near-wake Flow Fieldmentioning

confidence: 99%

“…Using a similar decoupled approach, the flow about the Mars Sample Return Orbiter was simulated at both flight conditions 4 and for a wind tunnel experiment. 5 The interface between NS and DSMC regions was taken as a plane cutting through the aeroshell lip. Although this practical approach was much more efficient than a full DSMC simulation, in one simulation, 20 million cells were used in the wake region.…”

Section: A Motivationmentioning

confidence: 99%

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Hybrid Particle-Continuum Simulations of Nonequilibrium Hypersonic Blunt-Body Flowfields

Schwartzentruber

Scalabrin

Boyd

2008

Journal of Thermophysics and Heat Transfer

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A modular particle-continuum (MPC) numerical method is presented which solves the Navier-Stokes (NS) equations in regions of near-equilibrium and uses the direct simulation Monte Carlo (DSMC) method where the flow is in non-equilibrium. The MPC method is designed specifically for steady-state, hypersonic, nonequilibrium flows and couples existing, state-of-the-art DSMC and NS solvers into a single modular code. The MPC method is tested for 2D flow of N 2 at various Mach numbers over a cylinder where the global Knudsen number is 0.01. For these conditions, NS simulations significantly over-predict the local shear-stress, and also over-predict the peak heating rate by 5-10% when compared with full DSMC simulations. DSMC also predicts faster wake closure and 10-15% higher temperatures in the immediate wake region. The MPC code is able to accurately reproduce DSMC flow field results, local velocity distributions, and surface properties up to 2.8 times faster than full DSMC simulations. The computational time saved by the MPC method is directly proportional to the fraction of the flow field which is in near-equilibrium. It is found that particle simulation of the shock interior is not necessary for accurate prediction of surface properties, however particle simulation of the boundary layer and near-wake region is.

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Comparison of a 3-D CFD-DSMC Solution Methodology With a Wind Tunnel Experiment

Cited by 14 publications

References 13 publications

Hybrid simulations of rarefied supersonic gas flows in micro-nozzles

Hybrid simulations of rarefied supersonic gas flows in micro-nozzles

Kinetic Models and Gas Kinetic Schemes for Hybrid Simulation of Partially Rarefied Flows

Hybrid Particle-Continuum Simulations of Nonequilibrium Hypersonic Blunt-Body Flowfields

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