000004646 001__ 4646
000004646 005__ 20141119144541.0
000004646 04107 $$aeng
000004646 046__ $$k2002-06-02
000004646 100__ $$aNassiri, Masoud
000004646 24500 $$aSIMULATION OF HORIZONTAL TURBULENCE IN SHALLOW RECIRCULATING FLOWS

000004646 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference
000004646 260__ $$bColumbia University in the City of New York
000004646 506__ $$arestricted
000004646 520__ $$2eng$$aThe Large Eddy Simulation method is employed in this study to compute shallow recirculating flows in an open channel. The depth- averaged equations are solved to calculate the large-scale horizontal turbulence. Sub-depth-scale viscosity and sub-grid-scale viscosity are determined by a modified Smagorinsky model. The computations were conducted for a range of friction effect from deep to shallow water depth. Flow parameters, such as the length of the main recirculating zone, the length of the secondary recirculation area, the wake width, the recirculation flow rate, the Reynolds stresses, the mean and fluctuations of a tracer concentration, are computed and are compared with the experimental data. The simulations are in agreement with the experimental data when optimal value of the Smagorinsky coefficient, Cs, is selected for the simulations. The optimal value of this coefficient is not constant but depends on the bed-friction number effect. It decreases rapidly from Cs = 0.26 to 0.14 as the bed-friction number increases from S = 0.027 to 0.25, respectively. 

000004646 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004646 653__ $$a

000004646 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002
000004646 720__ $$aNassiri, Masoud$$iChu, Vincent$$iBabarutsi, Sofia
000004646 8560_ $$ffischerc@itam.cas.cz
000004646 8564_ $$s387537$$uhttps://invenio.itam.cas.cz/record/4646/files/110.pdf$$yOriginal version of the author's contribution as presented on CD, .
000004646 962__ $$r4594
000004646 980__ $$aPAPER