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FEEG3011: Effect of the Turbulence Intensity - CFD Tutorial Case File - Management Assessment Answer
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Internal Code: D_BJ_DFBJ_BCF
Code: FEEG3011
Effect of the Turbulence Intensity Assessment Answer
Assignment Task: FEEG3011 Objectives: 1) to demonstrate a good quality solution for the problem of a three-dimensional turbulent fluid flow and heat transfer in a mixing elbow; 2) to describe the effect of the turbulence intensity at the inlets on the turbulence mixing. Part 1 - FEEG3011- Load your CFD tutorial case file (i.e. the refined mesh), change the turbulence intensity at the two inlets from 5% to 15%, and keep other settings unchanged. Run the new case, and demonstrate whether the simulation is converged. Write down the crucial numerical settings.
- Compare temperature contour plots (such as Fig. 3.19 in the CFD tutorial on the Blackboard) by using different turbulence intensities, i.e. 5% to 15%, and comment on the difference. [10 marks]
- Plot temperature profiles at the outlet (such as Fig. 3.22 in the CFD tutorial) by using different turbulence intensities, i.e. 5% to 15%, and comment on the difference.
- Draw a summary of the effect of turbulence intensity at the two inlets on the mixing of the temperature in the elbow. Have a discussion on this effect, and explain the reasons.
- Load your CFD tutorial case file (i.e. the refined mesh). Calculate the Reynolds number based on the velocity magnitude and the diameter at the main inlet. Change the dynamic viscosity from 0.0008 [kg/m-s] to 0.08 [kg/m-s] (see the figure on page 137 in the CFD tutorial for reference). Calculate the Reynolds number based on the velocity magnitude and the diameter at the main inlet after the change of dynamic viscosity. Change the Viscous Model from k-epsilon model to Laminar (see page 135 in the CFD tutorial for reference), and check whether the inflow conditions at the two inlets are changed accordingly. Keep other settings unchanged. Comment on the change of the Viscous Model in terms of the Reynolds number.
- Run this new case, and demonstrate whether the simulation is converged. FEEG3011
- If the simulation is converged in Question 6, compare temperature contour plot (such as Fig. 3.19 in the CFD tutorial) with that in Part 1, and compare temperature profile at the outlet (such as Fig. 3.22 in the CFD tutorial) with that in Part 1. FEEG3011
- Discuss on the observed difference Question 7. If the simulation is not converged, comment on the reason, and increase the viscosity further to 0.8 [kg/m-s] to achieve convergence results, and perform the comparison requested above in Question 7. FEEG3011
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