scholarly journals Parallel Mesh Adaptive Techniques for Complex Flow Simulation: Geometry Conservation

2012 ◽  
Vol 2012 ◽  
pp. 1-13
Author(s):  
Angelo Casagrande ◽  
Pénélope Leyland ◽  
Luca Formaggia
Keyword(s):  
Computer Aided Design ◽  
Unstructured Grids ◽  
Flow Simulation ◽  
Mesh Adaptation ◽  
Computational Time ◽  
Complex Flow ◽  
Efficient Tool ◽  
Refinement Process ◽  
Solution Accuracy ◽  
Aided Design

Dynamic mesh adaptation on unstructured grids, by localised refinement and derefinement, is a very efficient tool for enhancing solution accuracy and optimising computational time. One of the major drawbacks, however, resides in the projection of the new nodes created, during the refinement process, onto the boundary surfaces. This can be addressed by the introduction of a library capable of handling geometric properties given by a CAD (computer-aided design) description. This is of particular interest also to enhance the adaptation module when the mesh is being smoothed, and hence moved, to then reproject it onto the surface of the exact geometry.

scholarly journals Parallel Mesh Adaptive Techniques Illustrated with Complex Compressible Flow Simulations

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
Pénélope Leyland ◽  
Angelo Casagrande ◽  
Yannick Savoy
Keyword(s):  
Unstructured Grids ◽  
Mesh Adaptation ◽  
Computational Time ◽  
A Posteriori ◽  
Parallel Solution ◽  
Flow Simulations ◽  
Grid Adaption ◽  
Solution Accuracy ◽  
2D And 3D ◽  
Time Grid

The aim of this paper is to discuss efficient adaptive parallel solution techniques on unstructured 2D and 3D meshes. We concentrate on the aspect of parallel a posteriori mesh adaptation. One of the main advantages of unstructured grids is their capability to adapt dynamically by localised refinement and derefinement during the calculation to enhance the solution accuracy and to optimise the computational time. Grid adaption also involves optimisation of the grid quality, which will be described here for both structural and geometrical optimisation.

Development of CAD-to-CAE Model Preparation Technology

2013 ◽  
Vol 459 ◽  
pp. 325-329
Author(s):  
Tetsuyuki Kubota ◽  
Peter Chow
Keyword(s):  
Computer Aided Design ◽  
Preparation Technology ◽  
Topological Information ◽  
3 Dimensional ◽  
3D Cad ◽  
Computer Aided ◽  
Long Time ◽  
Model Preparation ◽  
Solution Accuracy ◽  
Aided Design

This paper explains and demonstrates how to reduce time for preparation of 3-dimensional (3D) geometrical Computer-Aided-Engineering (CAE) model from 3D Computer-Aided-Design (CAD) data. In generally, CAE model preparation is labor intensive and takes long time. Main part of preparation work is simplification of 3D-CAD data to decrease mesh scale and without impacting the solution accuracy. The purpose of this study is to create automatic CAE model preparation technology for reduction of preparation time. In this study, automatic model preparation method is developed by using of geometrical and topological information of 3D-CAD data. Benchmark test is performed to proof the efficiency of the method.

Computer-Aided Design of a TSOP II LOC Package Using Taguchi’s Parameter Design Method to Optimize Mold-Flow Balance

2003 ◽  
Vol 125 (2) ◽  
pp. 268-275 ◽  
Author(s):  
Hung-Lung Lee ◽  
Shyang-Jye Chang ◽  
Sheng-Jye Hwang ◽  
Francis Su ◽  
S. K. Chen
Keyword(s):  
Computer Aided Design ◽  
Design Method ◽  
Flow Simulation ◽  
Design Parameters ◽  
Packaging Design ◽  
Control Factors ◽  
Flow Balance ◽  
Robust Design Method ◽  
Aided Design ◽  
Mold Flow

This paper presents a methodology for TSOP II LOC packaging design. The design objectives are: 1) to optimize mold-flow balance, which in turn minimizes air traps, and 2) to minimize manufacturing variability, which implies optimal quality. A mold-flow simulation tool called C-MOLD is used to evaluate various design configurations. Taguchi’s robust design method is used for manufacturing variability considerations. The simulated results are verified with experimental flow patterns produced by means of “short shots.” In the nomenclature of the Taguchi method, mold-flow balance was chosen as quality characteristics and select a set of design parameters called control factors. The objectives are to find the levels of the control factors, which optimize the flow balance, and, at the same time, minimize the sensitivity of the variations of the control factors.

scholarly journals Evaluation of Working Temperature in Wind Turbine Bearings by Simulation of Lubricant Level

2021 ◽  
Vol 16 (1) ◽  
pp. 99-104
Author(s):  
Yorley Arbella Feliciano ◽  
Carlos A. Trinchet Varela ◽  
Javier A. Vargas Guativas ◽  
Leandro L. Lorente-Leyva ◽  
Diego H. Peluffo-Ordóñez
Keyword(s):  
Computer Aided Design ◽  
Wind Farm ◽  
Thermal State ◽  
Flow Simulation ◽  
Engineering Software ◽  
Theoretical Predictions ◽  
Computational Fluid Dynamics Cfd ◽  
Historical Database ◽  
Aided Design ◽  
And Behavior

After studies related to the technical state and behavior of the temperatures manifested by the bearings of the generators that make up the Goldwind wind turbines models S50-750, installed in the Gibara II Wind Farm (PE). It was identified and validated as a tool that enables early diagnosis of anomalous bearing behaviors, SolidWorks (SW) computer-aided design and engineering software (CAD-CAE) and the Flow Simulation add-on. Since it allows studies based on the computational fluid dynamics (CFD), of the temperatures that are manifested in the lubricant during the different working regimes of the generator. The studies carried out evaluated the environmental conditions of exploitation in Cuba. It works on obtaining and predicting the values of the thermal state using the principles and methods for the calculation of heat transfer, the forecast statistics apply. The research supports its theories and postulates in a sample of 6 installed equipment, from China, for it had a historical database that collects temperature measurements in different working conditions which allowed to establish correlation between theoretical predictions and real behaviors.

Accuracy and Reproducibility of CFD Predicted Wall Shear Stress Using 3D Ultrasound Images

2003 ◽  
Vol 125 (2) ◽  
pp. 218-222 ◽  
Author(s):  
A. D. Augst ◽  
D. C. Barratt ◽  
A. D. Hughes ◽  
F. P. Glor ◽  
S. A. McG. Thom ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Cfd Simulation ◽  
Imaging Techniques ◽  
Flow Simulation ◽  
3D Ultrasound ◽  
Quantitative Agreement ◽  
Ultrasound Images ◽  
Simulation Techniques ◽  
Average Maximum ◽  
Aided Design

Computational fluid dynamics (CFD) flow simulation techniques have the potential to enhance our understanding of how haemodynamic factors are involved in atherosclerosis. Recently, 3D ultrasound has emerged as an alternative to other 3D imaging techniques, such as magnetic resonance angiography (MRA). The method can be used to generate realistic vascular geometry suitable for CFD simulations. In order to assess accuracy and reproducibility of the procedure from image acquisition to reconstruction to CFD simulation, a human carotid artery bifurcation phantom was scanned three times using 3D ultrasound. The geometry was reconstructed and flow simulations were carried out on the three sets as well as on a model generated using computer aided design (CAD) from the geometric information given by the manufacturer. It was found that the three reconstructed sets showed good reproducibility as well as satisfactory quantitative agreement with the CAD model. Analyzing two selected locations probably representing the ‘worst cases,’ accuracy comparing ultrasound and CAD reconstructed models was estimated to be between 7.2% and 7.7% of the maximum instantaneous WSS and reproducibility comparing the three scans to be between 8.2% and 10.7% of their average maximum.

Parametric modelling of helical rotors for efficient design of twin-screw superchargers

2007 ◽  
Vol 221 (2) ◽  
pp. 267-272 ◽  
Author(s):  
K Ilie ◽  
A Subic
Keyword(s):  
Performance Optimization ◽  
Computer Aided Design ◽  
Geometric Model ◽  
Three Dimensional ◽  
Flow Simulation ◽  
Parametric Modelling ◽  
Efficient Design ◽  
Rotor Profile ◽  
Twin Screw ◽  
Aided Design

The parametric three-dimensional geometric model of twin-screw supercharger rotors of any aspect ratio was developed. For model validation through visualization, computer-aided design (CAD) rotor models with scalable data were generated in commercial CAD software and calibrated experimentally by laser Doppler velocimetry (LDV) tests. Calibrated rotor profile data can be transferred into CAD-CFD interface for flow simulation for performance optimization.

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