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Performance of fast...
Performance of fast fluid dynamics with a semi-Lagrangian scheme and an implicit upwind scheme in simulating indoor/outdoor airflow
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- Liu, Wei, Assistant Professor, 1987- (författare)
- KTH,Hållbara byggnader
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- Sun, Haowen (författare)
- Dalian University of Technology, China,Dalian Univ Technol, Sch Civil Engn, Dalian 116024, Peoples R China.
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- Lai, Dayi (författare)
- Shanghai Jiao Tong University, China,Shanghai Jiao Tong Univ, Sch Design, Dept Architecture, Shanghai 200240, Peoples R China.
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- Xue, Yu (författare)
- Dalian University of Technology, China,Dalian Univ Technol, Sch Civil Engn, Dalian 116024, Peoples R China.
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- Kabanshi, Alan (författare)
- Högskolan i Gävle,Energisystem och byggnadsteknik,Univ Gävle, Dept Bldg Engn Energy Syst & Sustainabil Sci, S-80176 Gävle, Sweden.
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- Hu, Simon (författare)
- Zhejiang University, China,Zhejiang Univ, Sch Civil Engn, ZJU UIUC Inst, Haining 314400, Peoples R China.
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(creator_code:org_t)
- Elsevier, 2022
- 2022
- Engelska.
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Ingår i: Building and Environment. - : Elsevier. - 0360-1323 .- 1873-684X. ; 207:B
- Relaterad länk:
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https://doi.org/10.1...
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https://hig.diva-por... (primary) (Raw object)
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Computational fluid dynamics can be time consuming for predicting indoor airflows and pollutant transport in large-scale problems or emergency management. Fast fluid dynamics (FFD) is able to accomplish efficient and accurate simulation of indoor/outdoor airflow. FFD solves the advection term of the Navier–Stokes equations either by a semi-Lagrangian (SL) scheme or an implicit upwind (IU) scheme. The SL scheme can be highly efficient, but its first-order version is not conservative and introduces significant numerical diffusion. To improve its accuracy, a high-order temporal and interpolation scheme that not only reduces dissipation and dispersion errors but also guarantees the convergence speed should be applied. Otherwise, an IU scheme instead could be used to solve the advection term. The IU scheme is conservative and introduces minor numerical diffusion, but it may increase the computation time. Therefore, this study investigated the performance of FFD with SL scheme using high-order temporal and interpolation schemes and that with IU scheme. The comparisons used experimental data of two indoor airflows and one outdoor airflow. The results showed that FFD with IU scheme was overall more accurate than FFD with SL scheme. In simulating indoor airflow, both methods were robust and the predictions were independent of time step sizes if the Courant number was less than or equal to one. In simulating the outdoor airflow, the FFD with SL scheme performed better than the FFD with IU scheme for large time step sizes. The FFD with IU scheme consumed 44%–61% computing time of the FFD with SL scheme.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Samhällsbyggnadsteknik -- Husbyggnad (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Civil Engineering -- Building Technologies (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Energiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Energy Engineering (hsv//eng)
Nyckelord
- Pressure-correction scheme
- Numerical diffusion
- Time step size
- OpenFOAM
- building simulations
- Hållbar stadsutveckling
- Sustainable Urban Development
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- ref (ämneskategori)
- art (ämneskategori)
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