A low-dissipation scheme based on OpenFoam designed for large eddy simulation in compressible flow

Lee, Yachao; Yao, Wei; Fan, Xuejun

doi:10.2514/6.2017-2444

Cited by 7 publications

(4 citation statements)

References 36 publications

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“…Equation (3) presents the fourth-order central scheme used to reconstruct the values at the interface in unstructured grids. Similar approaches have been used by Khalighi et al, 26 Lowe et al 27 and Yachao et al 25 f f ¼ 1 2…”

Section: Aerodynamic Computationmentioning

confidence: 85%

“…Therefore, we use a combination of the dissipative Kurganov-Tadmor scheme and a non-dissipative central scheme to handle the sharp gradients and fine scale turbulence structures, respectively. Yachao et al 25 used a similar approach by employing a shock sensor to identify cells with high gradients and partitioning the flow field into two regions. In the first region, containing the cells with high gradients, a dissipative scheme is used to capture flow discontinuities.…”

Section: Aerodynamic Computationmentioning

confidence: 99%

“…Yachao et al. 25 used a similar approach by employing a shock sensor to identify cells with high gradients and partitioning the flow field into two regions. In the first region, containing the cells with high gradients, a dissipative scheme is used to capture flow discontinuities.…”

Section: Aerodynamic Computationmentioning

confidence: 99%

“…27 and Yachao et al. 25 where ζ represents the flow variables and d ij is the displacement vector between the centers of two adjacent cells. A low-storage third-order TVD Runge-Kutta based scheme proposed by Gottlied and Shu 28 is employed in this study.…”

Section: Aerodynamic Computationmentioning

confidence: 99%

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Use of downstream fluid injection to reduce subsonic jet noise

Rajput¹,

Kumar

2019

International Journal of Aeroacoustics

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A fluid injection scheme consisting of multiple radial microjets located downstream from the nozzle exhaust is analyzed for its ability to suppress far field jet noise. Microjets in cross flow are known to enhance turbulent mixing due to the induced stream-wise vortices. Contrary to previous studies which injected fluid either inside the nozzle or just at the nozzle exhaust, this injection scheme uses a coaxial injector tube to inject multiple equally spaced microjets perpendicular to the jet axis at an axial location downstream from the nozzle exhaust. Microjet injection closer to the jet axis leads to the formation of a counter rotating vortex pair (CVP) close to the injection location which further beaks down into stream-wise vortices as the microjet bends and follows the flow direction. Detailed Large Eddy Simulations are performed for a nozzle-injector setup operating at Mach 0.9 jet with Reynolds number %10 6 to help understand the aerodynamic and acoustic features of the interaction of this fluid injection scheme with the main jet. Permeable Ffowcs Willaims Hawkings based formulation is used for computing the far field acoustic spectra for injector setups with various numbers of injection ports (n p) at two microphone locations. It is observed that as the number of microjets is increased, it leads to reduction in the far field noise. Peak noise reduction of % 4.5 dB is observed for both locations. However, beyond n p > 4 there is a lower acoustic benefit per additional port due to spatial interference between the induced CVPs.

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Section: Aerodynamic Computationmentioning

confidence: 85%

Section: Aerodynamic Computationmentioning

confidence: 99%

Section: Aerodynamic Computationmentioning

confidence: 99%

Section: Aerodynamic Computationmentioning

confidence: 99%

See 2 more Smart Citations

Use of downstream fluid injection to reduce subsonic jet noise

Rajput¹,

Kumar

2019

International Journal of Aeroacoustics

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Large Eddy Simulation of Axisymmetric Scramjet Based on Dynamic Zone Flamelet Model

Sun

Liu

et al. 2022

Lecture Notes in Electrical Engineering

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Influences of Domain Symmetry on Supersonic Combustion Modeling

Yao

2019

Journal of Propulsion and Power

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A new attempt is made to simulate progressive failure processes in heterogeneous brittle materials such as concrete, ceramics, rocks etc., by considering the time-dependence of stress redistributions induced by local breakages. Two mechanisms of stress redistribution are incorporated into the proposed model in order to account for the influence of each local breakage on the remaining specimen: (1) one is the immediate release of internal forces in the breaking element, which is assumed to happen within an infinitesimal time when compared with the characteristic time of external loadings. The release of such internal forces is hence suddenly applied to the remaining specimen, which is considered to take time to deform correspondingly due to material viscosity. This deformation delay is implemented by introducing a viscous force (VF) field prevailing in the entire specimen. (2) The other is the gradual release of previously stored VF fields, whose characteristic time is assumed to be material-dependent. Here the release of VF is approximated as stepwise for simplicity. The proposed model is found to be capable of overcoming the unreasonablylow-ductility problem encountered in many existing lattice models when it comes to the uniaxial tensile test. Furthermore, the force-displacement response obviously depends on the ratio of the VF releasing time to the characteristic time of external loading, showing trends agreeing with experimental observations. Compared with results without viscosity, the failure pattern is more scattering, and the force-displacement curve has a higher peak load and a more ductile post-peak tail.

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A low-dissipation scheme based on OpenFoam designed for large eddy simulation in compressible flow

Cited by 7 publications

References 36 publications

Use of downstream fluid injection to reduce subsonic jet noise

Use of downstream fluid injection to reduce subsonic jet noise

Large Eddy Simulation of Axisymmetric Scramjet Based on Dynamic Zone Flamelet Model

Influences of Domain Symmetry on Supersonic Combustion Modeling

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