By H. Oh

ISBN-10: 9535102702

ISBN-13: 9789535102700

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The turbulence models are summarized in Table 4 Family group Reynolds – Averaged Navier – Stokes (RANS) Models Zero equation models One equation models Two equation models κ–ε κ–ω Reynolds Stress Model (RSM) Large Eddy Simulation (LES) Description and advantages Smagorinsky-Lilly model Dynamic subgrid-scale model RNG – LES model WALLE model The most widely used models. Its main advantages are short computation time, stable calculations and reasonable results for many flows. Provides good predictions for all types of flows, including swirl, and separation.

This experimental analysis requires specialized measurement techniques are able to explain the flow field must also be automated to minimize human involvement in the process of collecting data. The measurement techniques, to capture the important fluids dynamic behavior of the twophase flow, can be classified as non-intrusive (NMT) and intrusive (IMT) techniques. The intrusive techniques are generally probes used to study local basic flow phenomena. Some of these are intended only as research instruments.

Finite volume (FV) method The FV discretization method is obtained by integrating the transport equation around a finite volume. The general form of transport equations is given by:     t        v        S     I  II  III (13) IV i. Transient term ii. Convective term iii. Diffusive term iv. Source term The transport equations are integrated in each computational cell using the divergence theorem over a given time interval ∆t:          dV    v  dA      dA   S dV  dt  v V t t t     t (14) Linearization and interpolation techniques can be clarified considering the finite volume P shown in Figure 3.

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Advanced Fluid Dynamics by H. Oh

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