Q value colored by vorticity magnitude. |
Researcher: |
Lars Davidson lada@chalmers.se |
Publications: | [1-5] |
Embedded LES Embedded LES is an approach that combines LES and RANS, in which an LES region is embedded in any desired region, coupled with surrounding RANS simulations, and the location of the RANS-LES interaction is specified, for example, over a surface normal to the streamwise direction, as shown in Fig. 2. Regions with flow separation and vortex motions are typically treated using embedded LES, while the rest of the computational domain is accommodated by RANS. Figure 2. Channel flow: Embedded LESIn general, the LES region may be embedded in between upstream and downstream RANS regions. The emphasis in the present study is however on the RANS-LES coupling over the interface when going from an upstream RANS region to a downstream LES region as illustrated in Fig. 2. In this type of configuration, the critical issue in the RANS-LES coupling is how to create resolved turbulence at the interface and how to dampen modelled RANS turbulence when the flow enters into the LES region.
In [1-2], synthetic turbulent fluctuations are used for inlet boundary conditions.
This is a first step for embedded LES. The method is applied for the flow over
a 3D hill, the ONERA bump and the flow in an asymmetric diffuser.
In [3,4] the PANS model is used in embedded LES for channel flow and the flow over
a hump.
REFERENCES
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