A High-Order High-Accuracy Geometric Block Interface Treatment for Computational Aeroacoustics Codes
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University of Toledo / OhioLINK
2016
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=toledo1463099661 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-toledo14630996612021-08-03T06:36:39Z A High-Order High-Accuracy Geometric Block Interface Treatment for Computational Aeroacoustics Codes Mansouri Boroujeni, Nima Aerospace Engineering Mechanical Engineering Numerical performance in computational aeroacoustics (CAA) has been driven the use of structured multi-block codes for modeling problems in the aeronautic industry.Structured grids reduce the amount of communication in a numerical simulation,leading to higher computational speeds and lower cost. CAA codes are applied to realproblems, so they must be capable of handling complex geometries. The structureof the complex geometries may lead to grid discontinuities and/or singularities atblock interfaces. These discontinuities are the primary sources of error in the codes,signicantly reducing a codes performance. The geometric block interface treatment(GBIT) is a new approach to improve grid block discontinuity issues at block interfacesfor structured multi-block codes.This article first reviews what researchers have done to treat block interfaces.Then, the mathematical model of our geometry-based treatment is proposed. Thismethod was implemented in the high-order, high-accuracy NASA Glenn ResearchCenter Broadband Aeroacoustic Stator Simulation (BASS) CAA code. Here, the ini-tial results for two-dimensional test cases are shown. To determine the performanceof the new method, the results are verified by Ingraham’s External Verification Ap-proach (EVA). Initial results are promising and reach expected convergence rate.However, instability and inaccuracy appear in the solution.Artificial dissipation and special differencing schemes are revealed to be the maincauses of instability and inaccuracy, respectively. To overcome these problems, in-terior dissipation stencils replace biased stencils at interface regions. Smooth gridclustering is proposed to improve the accuracy of the spatial schemes performancenear interfaces, which consequently strengthens the accuracy of the solution. Allthese new results are laid out, verified, and implemented in basic form. 2016 English text University of Toledo / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=toledo1463099661 http://rave.ohiolink.edu/etdc/view?acc_num=toledo1463099661 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Aerospace Engineering Mechanical Engineering |
| spellingShingle |
Aerospace Engineering Mechanical Engineering Mansouri Boroujeni, Nima A High-Order High-Accuracy Geometric Block Interface Treatment for Computational Aeroacoustics Codes |
| author |
Mansouri Boroujeni, Nima |
| author_facet |
Mansouri Boroujeni, Nima |
| author_sort |
Mansouri Boroujeni, Nima |
| title |
A High-Order High-Accuracy Geometric Block Interface Treatment for Computational Aeroacoustics Codes |
| title_short |
A High-Order High-Accuracy Geometric Block Interface Treatment for Computational Aeroacoustics Codes |
| title_full |
A High-Order High-Accuracy Geometric Block Interface Treatment for Computational Aeroacoustics Codes |
| title_fullStr |
A High-Order High-Accuracy Geometric Block Interface Treatment for Computational Aeroacoustics Codes |
| title_full_unstemmed |
A High-Order High-Accuracy Geometric Block Interface Treatment for Computational Aeroacoustics Codes |
| title_sort |
high-order high-accuracy geometric block interface treatment for computational aeroacoustics codes |
| publisher |
University of Toledo / OhioLINK |
| publishDate |
2016 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1463099661 |
| work_keys_str_mv |
AT mansouriboroujeninima ahighorderhighaccuracygeometricblockinterfacetreatmentforcomputationalaeroacousticscodes AT mansouriboroujeninima highorderhighaccuracygeometricblockinterfacetreatmentforcomputationalaeroacousticscodes |
| _version_ |
1719440291722690560 |