Hybrid simulations of rarefied supersonic gas flows in micro-nozzles

Torre, Federico La; Kenjereš, Saša; Moerel, J.L.P.A.; Kleijn, Chris R.

doi:10.1016/j.compfluid.2011.06.008

Cited by 48 publications

(24 citation statements)

References 57 publications

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“…Therefore, we simply employ sampling from the Maxwellian distribution in the current work. It is also important to note that the sampling from the Maxwellian VDF has been reported by other researchers as well, for example, see Reference . They also report achieving suitable accuracy.…”

Section: Resultssupporting

confidence: 58%

A hybrid DSMC/Navier–Stokes frame to solve mixed rarefied/nonrarefied hypersonic flows over nano‐plate and micro‐cylinder

Darbandi

Roohi

2013

Numerical Methods in Fluids

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SUMMARYWe extend a hybrid DSMC/Navier–Stokes (NS) approach to unify the DSMC and the NS simulators in one framework capable of solving the mixed non‐equilibrium and near‐equilibrium flow regions efficiently. Furthermore, we use a one‐way state‐based coupling (Dirichlet–Dirichlet boundary‐condition coupling) to transfer the required information from the continuum region to the rarefied one. The current hybrid DSMC–NS frame is applied to the hypersonic flows over nanoflat plate and microcylinder cases. The achieved solutions are compared with the pure DSMC and NS solutions. The results show that the current hybrid approach predicts the surface heat transfer rate and shear stress magnitudes very accurately. Some important conclusions can be drawn from this study. For example, although the shock wave region would be a non‐equilibrium region, it is not necessary to use a pure DSMC simulator to solve it entirely. This is important when the researchers wish to predict the surface properties such as velocity slip, temperature jump, wall heat flux rate, and friction drag magnitudes accurately. Our investigation showed that our hybrid solution time would be at least 40% (for the flat plate) and 35% (for the cylinder) of the time that must be spent by a pure DSMC solver to attain the same accuracy.Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Resultssupporting

confidence: 58%

A hybrid DSMC/Navier–Stokes frame to solve mixed rarefied/nonrarefied hypersonic flows over nano‐plate and micro‐cylinder

Darbandi

Roohi

2013

Numerical Methods in Fluids

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“…Several different continuum breakdown parameters have been proposed by former researchers, such as the P parameter proposed by Bird [1], the B parameter proposed by Garcia [24], and the Kn GL proposed by Wang and Boyd [25]; among which, the Kn GL parameter is used more widely [7,14,26,27] and is employed in our research to represent the breakdown of continuum hypothesis. DSMC method is valid in both continuum and rarefied regions, but as the flow density increases, the computational efficiency of DSMC reduces extremely because of the decrease of mean free path of molecules, thus more particles are needed, and at the same time the collision number increases.…”

Section: Interface Locationmentioning

confidence: 99%

Investigation on a coupled Navier–Stokes–Direct Simulation Monte Carlo method for the simulation of plume flowfield of a conical nozzle

Tang

Cai

2014

Numerical Methods in Fluids

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SUMMARY To assess the plume effects of space thrusters, the accurate plume flowfield is indispensable. The plume flow of thrusters involves both continuum and rarefied flow regimes. Coupled Navier–Stokes–Direct Simulation Monte Carlo (NS–DSMC) method is a major approach to the simulation of continuum‐rarefied flows. An axisymmetric coupled NS–DSMC solver, possessing adaptive‐interface and two‐way coupling features, is investigated in this paper for the simulation of the nozzle and plume flows of thrusters. The state‐based coupling scheme is adopted, and the gradient local Knudsen number is used to indicate the breakdown of continuum solver. The nitrogen flows in a conical nozzle and its plume are chosen as the reference case to test the coupled solver. The threshold value of the continuum breakdown parameter is studied based on both theoretical kinetic velocity sampling and coupled numerical tests. Succeeding comparisons between coupled and full DSMC results demonstrate their conformities, meanwhile, the former saves 58.8% computational time. The pitot pressure evaluated from the coupled simulation result is compared with the experimental data proposed in literatures, revealing that the coupled method makes precise predictions on the experimental pitot pressure. Copyright © 2014 John Wiley & Sons, Ltd.

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“…Afazov [3] showed that micro-milling was a desirable process for producing complex 3D micro-geometries. Torre [4] and Chen [5] claimed that micro-spacecraft could meet the requirements of faster, better and less expensive space exploration. Johan [6] and Chou [7] concluded that microsatellite could simply achieve its orbit adjustment, station keep and attitude control with the aid of micropropulsion system.…”

Section: Introductionmentioning

confidence: 99%

Fluid mechanics of internal flow with friction and cutting strategies for micronozzles

Cai

Wang

Song

et al. 2015

International Journal of Mechanical Sciences

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Hybrid simulations of rarefied supersonic gas flows in micro-nozzles

Cited by 48 publications

References 57 publications

A hybrid DSMC/Navier–Stokes frame to solve mixed rarefied/nonrarefied hypersonic flows over nano‐plate and micro‐cylinder

A hybrid DSMC/Navier–Stokes frame to solve mixed rarefied/nonrarefied hypersonic flows over nano‐plate and micro‐cylinder

Investigation on a coupled Navier–Stokes–Direct Simulation Monte Carlo method for the simulation of plume flowfield of a conical nozzle

Fluid mechanics of internal flow with friction and cutting strategies for micronozzles

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