Optimal mesh topology generation for CFD

Ali, Zaib; Tucker, Paul G.; Shahpar, Shahrokh

doi:10.1016/j.cma.2016.12.001

Cited by 21 publications

(10 citation statements)

References 67 publications

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“…Analysis has shown that for the general case unstructured meshes as produced by all of the gmsh algorithms are inferior in their quality to structured meshes (Ali et al, 2016). Therefore the on hand results have to be set into relation with the mesh quality of structured approaches for an urban environment geometry model in future experiments.…”

Section: Resultsmentioning

confidence: 99%

“…Generating a well-formed mesh poses as one of the most time consuming and error-prone steps in CFD processing (Ali et al, 2016). Despite a high accuracy of the building model a mesh poorly derived from this 3D data can lead to largely inaccurate calculation results.…”

Section: Motivationmentioning

confidence: 99%

“…Reviews on general mesh generation methods and best practices concerning structured and unstructured meshes are given in (Ali et al 2016) and (Frey, 2005). (Reiter, 2008) gives an in-depth introduction on the configuration of the CFD framework and evaluation of results concerning urban environments, utilizing the FLUENT CFD simulation software.…”

Section: Comparable Literaturementioning

confidence: 99%

See 2 more Smart Citations

Evaluation of GMSH Meshing Algorithms in Preparation of High-Resolution Wind Speed Simulations in Urban Areas

Langheinrich

2018

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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This paper aims to evaluate the applicability of automatically generated meshes produced within the gmsh meshing framework in preparation for high resolution wind speed and atmospheric pressure simulations for detailed urban environments. The process of creating a skeleton geometry for the meshing process based on level of detail (LOD) 2 CityGML data is described. Gmsh itself offers several approaches for the 2D and 3D meshing process respectively. The different algorithms are shortly introduced and preliminary rated in regard to the mesh quality that is to be expected, as they differ inversely in terms of robustness and resulting mesh element quality. A test area was chosen to simulate the turbulent flow of wind around an urban environment to evaluate the different mesh incarnations by means of a relative comparison of the residuals resulting from the finite-element computational fluid dynamics (CFD) calculations. The applied mesh cases are assessed regarding their convergence evolution as well as final residual values, showing that gmsh 2D and 3D algorithm combinations utilizing the Frontal meshing approach are the preferable choice for the kind of underlying geometry as used in the on hand experiments.

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Section: Resultsmentioning

confidence: 99%

Section: Motivationmentioning

confidence: 99%

Section: Comparable Literaturementioning

confidence: 99%

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Evaluation of GMSH Meshing Algorithms in Preparation of High-Resolution Wind Speed Simulations in Urban Areas

Langheinrich

2018

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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“…Mesh generation is one of the most time-consuming step, especially for three dimensional models [19]. Structured and unstructured meshes can be generated using commercial software.…”

Section: Mesh Sensitivity Verificationmentioning

confidence: 99%

Numerical Investigation into the Air Flow Distributions of the Air Conditioning System in the Modular Data Center

Dong¹

2019

AAMM

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Data center plays an increasingly important role in everyday life. As data center is becoming more and more powerful, energy consumption is also increasing dramatically. The air conditioning system occupies at least 50 percent of the total energy consumption. Therefore, delicate analysis on the air conditioning system could help to reduce energy consumption in data center. An advanced Finite Volume Method with RNG k−ε model and convective heat exchange model is used in this paper to study the airflow and the temperature distribution of modular data center under different arrangements. Specifically, the calculation formula of convective heat transfer coefficient for plate flow is adopted to simplify analysis; and fans on the back of racks are simplified to be walls with a certain pressure jump. Simulations reveal that, in the case where air conditioners are arranged face-to-face, the temperature distribution on the back of racks is not uniform, and local high temperature points emerge near the side wall of air conditioners. By analyzing the distribution of air flow and temperature, geometric model is optimized by using a diagonal rack arrangement and drilling holes on the side wall. In the same energy consumption situation, the overall maximum temperature of the optimized model is reduced by 2.3 • C compared with that of the original one, and the maximum temperature on the server surface is reduced by 1 • C. Based on the optimized model, the effect of the hot aisle distance on the temperature distribution is studied. By simulating four different cases with various distances of hot aisle of 100cm, 120cm, 130cm and 150cm, it is found that the temperature is generally lower and distributed more evenly in the case with 120cm hot aisle distance. This demonstrates that the distance of hot aisle has an effect on temperature.

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“…Different grades of meshing were used to simulate flow on the model. In order to correctly solve the boundary layer, especially in weir, it was necessary to have a very fine mesh (Ali et al 2017). A fine mesh was also required around the regulating mechanism, which consisted of the float and the discharge valve actuator, as well as its full potential trajectory.…”

Section: Spatial Approximationmentioning

confidence: 99%

Numerical Model for a Nineteenth-Century Hydrometric Module

Costa

Felipe

Pitarch

2019

J. Irrig. Drain Eng.

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The Cequia of Manresa is a 26-km open channel constructed in the fourteenth century that conveys water from the Llobregat River to the city of Manresa using an elevation difference of 10.4 m. The channel is still operational today, supplying water for domestic, industrial, and agricultural uses to an overall population of 150,000 people. A hydrometric module was constructed in 1864 to regulate the flow rate in the Cequia to under 1,000 L=s. This module was dismantled in 1959 and is currently nonoperational. This work studied the operation of the module and determined whether it met the objectives for which it was built. The module was modeled numerically. Owing to the lack of experimental measures from the module, the model was validated with an analytical model from the literature, which demonstrated its accuracy. The model was created by applying computational fluid dynamics (CFD) using FLOW-3D software. The results showed that the numerical model reproduced the dynamic behavior of the hydrometric module (transitory), and that the old automated system operated correctly, limiting the flow to the required value. The numerical models can be used as a tool for historical research.

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Optimal mesh topology generation for CFD

Cited by 21 publications

References 67 publications

Evaluation of GMSH Meshing Algorithms in Preparation of High-Resolution Wind Speed Simulations in Urban Areas

Evaluation of GMSH Meshing Algorithms in Preparation of High-Resolution Wind Speed Simulations in Urban Areas

Numerical Investigation into the Air Flow Distributions of the Air Conditioning System in the Modular Data Center

Numerical Model for a Nineteenth-Century Hydrometric Module

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