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Simulating the wind in an empty EFV

Simulating the wind in an empty EFV by Victor Reijs is licensed under CC BY-NC-SA 4.0

Introduction

One of the recommendatiosn of Blocken [Blocken, 2015], to verify CFD, is to determine the homogeneity of an empty Flow Volume (aka windtunnel). There are two situations that are imortant:
  1. one where we have one type of ground layer with a roughness height ks (as elobared below),
  2. and one to have two or more grounds layers with different roughness heights in a CFD model. 
On this web page a simulation of an empty External Flow Volume (EFV) with one ground layer, to determine horizontal homogeneity of domain [Blocken, 2007, 2015]) is documented. The inlet ABL is kept constant, while the ground ks is varied.
These CFD tips are being used.

This web page has the followig sections:

Bold purple text needs attention.

Working in SketchUp

Editing 3D-model in SIMSCALE

The following steps are done:

Configuring the CFD

The model is at Empty Flow Volume, SIMULATIONS: EFV; Simulation Runs: RH=5.44,Cs=0.9,MS=0.3,CB2, RH=0.0544,Cs=0.9,MS=0.3,CB2 and RH=544,Cs=0.9,MS=0.3,CB2.
The following steps were taken to derive the above Simulation Runs (based on CFD tips):

Running the CFD

Conclusions

References

Blocken, Bert et al.: CFD simulation of the atmospheric boundary layer: wall function problems. In: Atmospheric Environment 41  (2007), issue 3, pp. 238-252.
Blocken, Bert: Computational Fluid Dynamics for urban physics: Importance, scales, possibilities, limitations and ten tips and tricks towards accurate and reliable simulations. In: Building and Environment 91  (2015), pp. 219-245.
Franke, Jörg  et al. COST Action 732: Best practice guideline for the CFD simulation of flows in the urban environment. Brussels, COST Office 2007.
Wieringa, Jon and R. Agterberg: Mesoscale terrain roughness mapping of the Netherlands. In:  TR-115 (1989).

Acknowledgements

I would like to thank people, such as  Ezra van de Elst, Frank van Gool, SIMSCALE Support and others for their help, encouragement and/or constructive feedback. Any remaining errors in methodology or results are my responsibility of course!!! If you want to provide constructive feedback, please let me know.
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