Numerical Prediction of Turbulent Swirling Flows by Two-Equation Models and Large Eddy Simulation

1988 ◽  
pp. 1591-1594
Author(s):  
Toshio Kobayashi ◽  
Youhei Morinishi
Keyword(s):  
Large Eddy Simulation ◽  
Swirling Flows ◽  
Numerical Prediction ◽  
Eddy Simulation ◽  
Large Eddy

Effect of URANS and Hybrid RANS-Large Eddy Simulation Turbulence Models on Unsteady Turbulent Flows Inside a Side Channel Pump

2020 ◽  
Vol 142 (6) ◽  
Author(s):  
Yefang Wang ◽  
Fan Zhang ◽  
Shouqi Yuan ◽  
Ke Chen ◽  
Xueyuan Wei ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Turbulence Models ◽  
Swirling Flows ◽  
Navier Stokes ◽  
Side Channel ◽  
Fluid Exchange ◽  
Eddy Simulation ◽  
Internal Fluid ◽  
Large Eddy ◽  
Reynolds Averaged Navier Stokes

Abstract In this work, the unsteady Reynolds-averaged Navier–Stokes (URANS) and three hybrid Reynolds-averaged Navier–Stokes-large eddy simulation (RANS-LES) models are employed to resolve the vortical flows in a typical single-stage side channel pump, to evaluate the suitability of these advanced turbulence models in predicting the pump hydraulic performance and unstable swirling flows. By the comparison of the overall performance, it can be observed that the results obtained by scale-adapted simulation (SAS) are closer to test data than shear stress transport (SST), detached eddy simulation (DES) and filter-based model (FBM). Simultaneously, the distribution of axial velocity on the plane near the interface is used to describe the position and intensity of internal fluid exchange between impeller and side channel. It is obvious that the intensity of mass flow exchange is strong near the inner and outer edges. Then, the vortex core region illustrates that the vortex is easily produced near the interface due to internal fluid exchange. Finally, the evolutions of circumferential in-plane vortical structures are presented to further account for the process of fluid exchange and the main vortex flows. It reveals that the recirculation flow presents a strong instability during 6–7 blade pitches as the fluid enters into the impeller and the flow is stable in downstream 7–8 blade pitches. Besides, the flow turns to be unsteady near outlet affected by the sudden change of fluid direction. This work could provide some suggestions for the choice of appropriate turbulence model in simulating strong swirling flows.

Large Eddy Simulation of Swirling Flows in a Rectangular Channel

2000 ◽  
Vol 2000 (0) ◽  
pp. 255
Author(s):  
Kazuyoshi MATSUZAKI ◽  
Mizue MUNEKATA ◽  
Yasutake HARAMOTO ◽  
Hideki OHBA
Keyword(s):  
Large Eddy Simulation ◽  
Rectangular Channel ◽  
Swirling Flows ◽  
Eddy Simulation ◽  
Large Eddy

A study on swirling flows in a rectangular channel (LDV measurement, flow visualization and large eddy simulation)

2001 ◽  
Vol 10 (3) ◽  
pp. 205-210 ◽  
Author(s):  
Kazuyoshi Matsuzaki ◽  
Yasutake Haramoto ◽  
Mizue Munekata ◽  
Hideki Ohba
Keyword(s):  
Large Eddy Simulation ◽  
Flow Visualization ◽  
Rectangular Channel ◽  
Swirling Flows ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Ldv Measurement
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