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Numerical Modelling of Wind Tunnel Internal Flow for CFD Assisted Design
https://orcid.org/http://orcid.org/0000-0002-0010-8260
A full scale numerical study of a large low speed closed circuit wind tunnel has been carried out in this work. The paper shows the use of numerical results to improve the design and investigate the internal flow physics inside a wind tunnel circuit, whereas most of the existing wind tunnel designs have relied on analytical guidelines. Using a steady state RANS simulation on full scale wind tunnel, this work identifies regions with undesirable flow and design features causing such effects like test diffuser included angle and fan tail shape. The paper also discusses the lesser known requirements for effective flow simulation of a wind tunnel like roughness in walls, screens and honeycomb as porous boundary and considering fan geometry while solving for detailed flow field. The modelling of internal flow inside a tunnel required grid resolution of complete domain and proper location for domain boundary, i.e. inlet/outlet boundaries for convergence and a realistic flow simulation. This work found that the flow in complete wind tunnel is affected by flow features developing in one region and their interaction with turning, diffusing and contracting flowfields. In this context, the interaction of disintegrating fan tip vortices with centerbody wake is highlighted. The pressure drop calculation at various mass flow rates has been used to derive the energy ratio of the tunnel and the required performance characteristics of the fan. The CFD results were used to iteratively optimise the deisgn by modifying its components and ends up achieving a overall higher flow quality and lower energy ratio. The energy ratio of 3.2 was achieved for test jet speed of 70 m/s with 2.5×2 m2 cross-sectional area. The methodology presented in this paper for setting up wind tunnel numerical domain and numerical investigation of flow field to assist in wind tunnel design will give useful guideline for designers of such wind tunnel in future.
Numerical Modelling of Wind Tunnel Internal Flow for CFD Assisted Design
https://orcid.org/http://orcid.org/0000-0002-0010-8260
A full scale numerical study of a large low speed closed circuit wind tunnel has been carried out in this work. The paper shows the use of numerical results to improve the design and investigate the internal flow physics inside a wind tunnel circuit, whereas most of the existing wind tunnel designs have relied on analytical guidelines. Using a steady state RANS simulation on full scale wind tunnel, this work identifies regions with undesirable flow and design features causing such effects like test diffuser included angle and fan tail shape. The paper also discusses the lesser known requirements for effective flow simulation of a wind tunnel like roughness in walls, screens and honeycomb as porous boundary and considering fan geometry while solving for detailed flow field. The modelling of internal flow inside a tunnel required grid resolution of complete domain and proper location for domain boundary, i.e. inlet/outlet boundaries for convergence and a realistic flow simulation. This work found that the flow in complete wind tunnel is affected by flow features developing in one region and their interaction with turning, diffusing and contracting flowfields. In this context, the interaction of disintegrating fan tip vortices with centerbody wake is highlighted. The pressure drop calculation at various mass flow rates has been used to derive the energy ratio of the tunnel and the required performance characteristics of the fan. The CFD results were used to iteratively optimise the deisgn by modifying its components and ends up achieving a overall higher flow quality and lower energy ratio. The energy ratio of 3.2 was achieved for test jet speed of 70 m/s with 2.5×2 m2 cross-sectional area. The methodology presented in this paper for setting up wind tunnel numerical domain and numerical investigation of flow field to assist in wind tunnel design will give useful guideline for designers of such wind tunnel in future.
Numerical Modelling of Wind Tunnel Internal Flow for CFD Assisted Design
https://orcid.org/http://orcid.org/0000-0002-0010-8260
A full scale numerical study of a large low speed closed circuit wind tunnel has been carried out in this work. The paper shows the use of numerical results to improve the design and investigate the internal flow physics inside a wind tunnel circuit, whereas most of the existing wind tunnel designs have relied on analytical guidelines. Using a steady state RANS simulation on full scale wind tunnel, this work identifies regions with undesirable flow and design features causing such effects like test diffuser included angle and fan tail shape. The paper also discusses the lesser known requirements for effective flow simulation of a wind tunnel like roughness in walls, screens and honeycomb as porous boundary and considering fan geometry while solving for detailed flow field. The modelling of internal flow inside a tunnel required grid resolution of complete domain and proper location for domain boundary, i.e. inlet/outlet boundaries for convergence and a realistic flow simulation. This work found that the flow in complete wind tunnel is affected by flow features developing in one region and their interaction with turning, diffusing and contracting flowfields. In this context, the interaction of disintegrating fan tip vortices with centerbody wake is highlighted. The pressure drop calculation at various mass flow rates has been used to derive the energy ratio of the tunnel and the required performance characteristics of the fan. The CFD results were used to iteratively optimise the deisgn by modifying its components and ends up achieving a overall higher flow quality and lower energy ratio. The energy ratio of 3.2 was achieved for test jet speed of 70 m/s with 2.5×2 m2 cross-sectional area. The methodology presented in this paper for setting up wind tunnel numerical domain and numerical investigation of flow field to assist in wind tunnel design will give useful guideline for designers of such wind tunnel in future.
Numerical Modelling of Wind Tunnel Internal Flow for CFD Assisted Design
J. Inst. Eng. India Ser. C
Kesharwani, Shubham (author) / Mistry, Chetan S. (author) / Roy, Subhransu (author) / Roy, Arnab (author) / Sinhamahapatra, Kalyan P. (author)
Journal of The Institution of Engineers (India): Series C ; 105 ; 839-859
2024-08-01
21 pages
Article (Journal)
Electronic Resource
English
Numerical Modelling of Wind Tunnel Internal Flow for CFD Assisted Design
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