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  • 1.
    Davidson, L.
    et al.
    Chalmers.
    Peng, Shia Hui
    FOI, Swedish Defence Research Agency.
    Embedded LES using PANS2011Conference paper (Refereed)
    Abstract [en]

    An embedded LES modelling approach is explored and verified using the PANS (PartiallyAveraged Navier-Stokes) model as a platform. With the same base model, theturbulence-resolving LES region is embedded by setting the PANS model coefficient tofk < 1 as distinguished from its neighboring RANS region, where fk = 1 is specified. Theembedded LES approach is verified in computations of a turbulent channel flow and aturbulent flow over a hump. Emphasis is placed on the impact of turbulent conditions atthe RANS-LES interface using anisotropic velocity fluctuations generated from syntheticturbulence. The effects of model coefficient fk in the LES region, as well as of the spanwisesize of the computational domain and the grid resolution in this direction, are alsoinvestigated. It is shown that the embedded LES method based on the PANS modellingapproach is computationally feasible and able to provide reasonable turbulence-resolvingpredictions in the embedded LES region.

  • 2.
    Eliasson, Peter
    et al.
    Swedish Defence Research Agency, FOI.
    Peng, Shia-Hui
    Swedish Defence Research Agency, FOI.
    Hanifi, Ardeshir
    Swedish Defence Research Agency, FOI.
    Improving the Prediction for the NASA High-Lift Trap Wing Model2011In: 49th AIAA Aerospace Sciences Meeting, 2011Conference paper (Refereed)
  • 3.
    Ma, J.
    et al.
    Chalmers.
    Peng, Shia Hui
    Chalmers University of Technology.
    Partially Averaged Navier-Stokes Modeling of Turbulent Channel Flow with and without Forcing2009In: Turbulence, Heat and Mass Transfer 6, 2009Conference paper (Refereed)
  • 4.
    Ma, J.M.
    et al.
    Chalmers.
    Peng, Shia Hui
    Chalmers University of Technology; Swedish Defence Research Agency.
    Davidson, L.
    Chalmers.
    Wang, F.
    A low Reynolds number variant of partially-averaged Navier-Stokes model for turbulence2011In: International Journal of Heat and Fluid Flow, ISSN 0142-727X, E-ISSN 1879-2278, Vol. 32, no 3, p. 652-669Article in journal (Refereed)
    Abstract [en]

    A low Reynolds number (LRN) formulation based on the Partially Averaged Navier-Stokes (PANS) modelling method is presented, which incorporates improved asymptotic representation in near-wall turbulence modelling. The effect of near-wall viscous damping can thus be better accounted for in simulations of wall-bounded turbulent flows. The proposed LRN PANS model uses an LRN k-epsilon model as the base model and introduces directly its model functions into the PANS formulation. As a result, the inappropriate wall-limiting behavior inherent in the original PANS model is corrected. An interesting feature of the PANS model is that the turbulent Prandtl numbers in the k and epsilon equations are modified compared to the base model. It is found that this modification has a significant effect on the modelled turbulence. The proposed LRN PANS model is scrutinized in computations of decaying grid turbulence, turbulent channel flow and periodic hill flow, of which the latter has been computed at two different Reynolds numbers of Re = 10,600 and 37,000. In comparison with available DNS, LES or experimental data, the LRN PANS model produces improved predictions over the standard PANS model, particularly in the near-wall region and for resolved turbulence statistics. Furthermore, the LRN PANS model gives similar or better results - at a reduced CPU time - as compared to the Dynamic Smagorinsky model.

  • 5.
    Peng, Shia Hui
    KTH, School of Technology and Health (STH), Fluid and Climate Technology (closed 20090101).
    Hybrid RANS-LES modeling based on zero- and one-equation models for turbulent ow simulation2005In: Proc. 4th International Symposium on Turbulence and Shear Flow Phenomena, 2005Conference paper (Refereed)
  • 6.
    Peng, Shia Hui
    Swedish Defence Research Agency, FOI.
    Towards detached eddy simulation modelling using a k-equation turbulence model2006In: Proceedings of ECCOMAS CFD 2006 / [ed] P. Wesseling, E. O˜nate and J. P´eriaux, 2006Conference paper (Refereed)
    Abstract [en]

    A detached eddy simulation modelling approach is presented for turbulent flowcomputations, which is based on the transport equation for turbulent kinetic energy, k (andthus termed k-DES model). The model coefficients in the RANS form are calibrated inwall-attached flow computations, and the LES mode is calibrated in the simulation for de-caying, homogeneous, isotropic turbulence. To combine the near-wall RANS mode with theoff-wall LES mode, the RANS-LES interface is accomplished by means of an adaptationof turbulent length scales invoked in both the production term and the dissipation term ofthe k-equation. Examples presented for the modelling validation include a fully developedchannel flow, a periodic hill flow and a three-dimensional axisymmetric hill flow. Theresults are compared with available DNS, LES and experimental data, showing reasonableagreement.

  • 7.
    Peng, Shia Hui
    et al.
    Chalmers University of Technology.
    Davidson, L.
    Chalmers.
    Approximation of subgrid-scale stresses based on the Leonard expansion2009In: Turbulence, Heat and Mass Transfer 6 / [ed] K. Hanjali´c, Y. Nagano and S. Jakirli´c, 2009Conference paper (Refereed)
    Abstract [en]

    Based on the reconstruction series for subgrid-scale (SGS) stress tensor, SGS modellingis revisited. It is shown that, along with the first Leonard term in the series, the second term is alsoexploitable in relation to the viscous dissipation rate tensor, "ij , being further subjected to a Leonardexpansion. The approximation of "ij is discussed in analogy to RANS modelling. With the assumptionof anisotropy dissipation, it is shown that the second term can be approximated in terms of an eddyviscosityformulation, which, together with the first Leonard term, forms a two-term mixed model. Theresulting mixed model has been analyzed in LES of turbulent channel flow. The emphasis in the presentwork has been placed on the effect of model coefficients. The Leonard term may induce negative diffusionassociated to energy backscatter, while the second Smagorinsky term reinforces energy dissipation.Moreover, the modelled Leonard stresses have also been highlighted in the computation.

  • 8.
    Peng, Shia Hui
    et al.
    Chalmers University of Technology.
    Davidson, L.
    Chalmers.
    Computational study of a turbulent bump ow with Hybrid RANS-LES modelling2008In: Proceedings of the 7th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements, 2008Conference paper (Refereed)
  • 9.
    Peng, Shia Hui
    et al.
    Chalmers University of Technology.
    Hanjalic, K.
    Davidson, L.
    Large-eddy simulation and deduced scaling analysis of Rayleigh-Bernard convection up to Ra=10^92006In: Journal of turbulence, ISSN 1468-5248, E-ISSN 1468-5248, Vol. 7, no 66Article in journal (Refereed)
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