EGH423: Fluid Dynamics - Computational Domain Using Laminar and Turbulence Models - Engineering Assignment Help

Assignment Task:

Objectives:

Task 1: To validate/benchmark numerical simulation results for a given numerical model depicting the flow over a square cylinder against experimental data.

Task 2: To conduct transient simulations for a given computational domain using laminar and turbulence models.

Apparatus:

ANSYS CFX will be used as it is a commonly utilised CFD software tool and is also currently available at QUT.

Task 1: Validation of the Model

Description:

Incoming fluid flow past a two-dimensional (2D) bluff body has been a classical problem in fluid mechanics owing to its fundamental and practical significance. The flow is governed by the Reynolds number (????????), which dictates whether the flow will produce steady or transient downstream effects. For instance, past the critical Reynolds number (???????? ? 46) for flow over a square, vortices known as the Von Karman Vortex Street are created downstream of the body and detach periodically from either side of the body. Due to the alternating low-pressure zones from either side of the structure, vibrations are induced in the structure. If the frequency of this vibration coincides with the natural frequency of the structure, it may lead to damage/failure of the structure. Notably, many real-world fluid flows encounter this transient phenomenon, such as flow past a chimney, building, and even volcanoes.

Task 2 computational model:

Now that you have validated the computational model, you can now perform some simulations analysing the transient behaviour of the computational model below (Figure 3). The investigation will involve analysing air flow (???? = 1.225 ????????/????3 , ???? = 1.7894 ? 10−5 ???????? ⋅ ????) past a square body at two different Reynolds numbers, ???????? = 100 (transient laminar) and ???????? = 250 (transient turbulent) (Note: past the critical Reynolds number (???????????????? = 210), the wake past the square body transitions into a turbulent regime). A refined mesh file has been provided for the simulations.

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