flow over a hump: Embedded LES using PANS

Q value

Q value colored by vorticity magnitude.



Researcher: Lars Davidson
lada@chalmers.se
Publications: [1-5]


PANS
In the partially averaged Navier-Stokes (PANS) model and the Partially Integrated Transport Model (PITM), the turbulent viscosity is reduced by decreasing the destruction term in the dissipation (ε) equation which increases ε. This decreases the turbulent viscosity in two ways: first, the turbulent viscosity is reduced because of the enhancement of ε, and, second, the turbulent kinetic energy (k) decreases because of the increased dissipation term, ε.

In [1], a low-Reynolds number capability is added to the PANS model; the model is applied to channel flow, decaying grid turbulence and the flow over a hill. In [2,3] the PANS model is used in embedded LES (channel flow and the flow over a hump). Later [4] the model is applied to backstep flow and boundary layer flow. In the last paper [5], the PANS model is used as a zonal LES-RANS model. Near the wall it is used in RANS mode and further away from the wall the model is in LES mode, i.e. in turbulence-resolving mode.
 


 

 
REFERENCES
  1. Ma, J.M, S.-H. Peng, L. Davidson and F.J. Wang
    A low Reynolds number variant of partially-averaged Navier-Stokes model for turbulence, Int. J. Heat Fluid Flow, Vol. 32, pp. 652-669, 2011.
    Get article at publisher's www page
    View PDF file of manuscript
     
  2. L. Davidson and S.-H. Peng
    "Embedded LES Using PANS", I6th AIAA Theoretical Fluid Mechanics Conference, AIAA paper 2011-3108 27 - 30 Jun 2011, Honolulu, Hawaii.
    View PDF file
     
  3. L. Davidson
    "Large Eddy Simulation of Heat Transfer in Boundary Layer and Backstep Flow Using PANS", Turbulence, Heat and Mass Transfer 7 Hanjalic, Y. Nagano, D. Borello and S. Jakirlic (Editors), Begell House, Inc., 2012
    View PDF file
     
  4. L. Davidson
    "A New Approach of Zonal Hybrid RANS-LES Based on a Two-equation k-eps Model", ETMM9: International ERCOFTAC Symposium on Turbulence Modelling and Measurements, Thessaloniki, Greece, 2012
    View PDF file
     
  5. L. Davidson and S.-H. Peng
    "Embedded Large-Eddy Simulation Using the Partially Averaged Navier-Stokes Model", AIAA J, Vol. 51(5), pp. 1066-1079, 2013.
    View PDF file
     
  6. L. Davidson
    "The PANS k-eps model in a zonal hybrid RANS-LES formulation", International Journal of Heat and Fluid Flow, pp. 112-126, vol. 46, 2014.
    Get PDF file from publisher
    View PDF file of manuscript
     
  7. L. Davidson
    "A New Approach to Treat the RANS-LES interface in PANS", ETMM10: International ERCOFTAC Symposium on Turbulence Modelling and Measurements, Marbella, Spain, 2014
    View PDF file
     


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