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Author: Ranjith Tirunagari, Cornell University

Problem Specification
1. Pre-Analysis & Start-Up
2. Geometry
3. Mesh
4. Setup (Physics)
5. Solution
6. Results
7. Verification & Validation

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Pre-Analysis & Start-Up

Preliminary Analysis

In Large-Eddy Simulations, the instantaneous velocity U(x,t) is decomposed into a filtered component Ū(x,t) and a residual component u'(x,t). The filtered velocity component represents the large scale unsteady motions. In LES, the large scale turbulent motions are directly represented whereas the effects of small scale turbulent motions are modeled. The filtered equations for the filtered velocity can be obtained from the Navier-Stokes equations. The non-linear convective term in the momentum equation introduces a residual stress tensor which is due to the residual motions. Closure is needed for this residual stress tensor and hence require modeling. There are simple to complex models in FLUENT which we will use.

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More information on the LES can be found in Turbulent Flows book by Pope\[2000\].

Start ANSYS FLUENT

Since LES is a three-dimensional unsteady simulation, the computational domain is a full pipe. 

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The following figure shows the workbench window.

Higher Resolution Image
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Step 2 - : Geometry

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