Numerical Investigation of Flow Around a Deformed Vacuum Lighter-Than-Air Vehicle
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Wright State University / OhioLINK
2021
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=wright1622235951947085 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-wright16222359519470852021-08-03T07:17:36Z Numerical Investigation of Flow Around a Deformed Vacuum Lighter-Than-Air Vehicle Kerestes, Jared N. Mechanical Engineering Aerospace Engineering Large Eddy Simulation ANSYS FLUENT Computational Fluid Dynamics Lighter-Than-Air Vehicles Drag This study characterizes the functional dependence of drag on Reynolds number for a deformed vacuum lighter-than-air vehicle. The commercial computational fluid dynamics (CFD) code, FLUENT, is used to preform large eddy simulations (LES) over a range of Reynolds numbers; only Reynolds numbers less than 310,000 are considered. While the overarching goal is drag characterization, general flow-field physics are also discussed, including basic turbulence spectra. All large eddy simulations are preceded by a Reynolds-averaged Navier-Stokes (RANS) simulation using Menter’s shear stress transport (SST) model. The precursor RANS simulation serves to (1) provide realistic initial conditions, (2) decrease the time needed to achieve a statistically averageable state, (3) assess near-wall mesh resolution, and (4) provide an estimate of the integral length scale. After achieving a statistically averageable state, each LES is integrated for at least 5 through-flow times. For sub-grid scale modeling, turbulence kinetic energy (TKE) transport is enabled, as it is the only model which allows for direct assessment of TKE resolution; all simulations resolve at least 80% of the total TKE at every point in the computational domain. To validate this study, all calculated drag coefficients are compared with experimental wind tunnel data. 2021-06-02 English text Wright State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=wright1622235951947085 http://rave.ohiolink.edu/etdc/view?acc_num=wright1622235951947085 unrestricted This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Mechanical Engineering Aerospace Engineering Large Eddy Simulation ANSYS FLUENT Computational Fluid Dynamics Lighter-Than-Air Vehicles Drag |
| spellingShingle |
Mechanical Engineering Aerospace Engineering Large Eddy Simulation ANSYS FLUENT Computational Fluid Dynamics Lighter-Than-Air Vehicles Drag Kerestes, Jared N. Numerical Investigation of Flow Around a Deformed Vacuum Lighter-Than-Air Vehicle |
| author |
Kerestes, Jared N. |
| author_facet |
Kerestes, Jared N. |
| author_sort |
Kerestes, Jared N. |
| title |
Numerical Investigation of Flow Around a Deformed Vacuum Lighter-Than-Air Vehicle |
| title_short |
Numerical Investigation of Flow Around a Deformed Vacuum Lighter-Than-Air Vehicle |
| title_full |
Numerical Investigation of Flow Around a Deformed Vacuum Lighter-Than-Air Vehicle |
| title_fullStr |
Numerical Investigation of Flow Around a Deformed Vacuum Lighter-Than-Air Vehicle |
| title_full_unstemmed |
Numerical Investigation of Flow Around a Deformed Vacuum Lighter-Than-Air Vehicle |
| title_sort |
numerical investigation of flow around a deformed vacuum lighter-than-air vehicle |
| publisher |
Wright State University / OhioLINK |
| publishDate |
2021 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=wright1622235951947085 |
| work_keys_str_mv |
AT kerestesjaredn numericalinvestigationofflowaroundadeformedvacuumlighterthanairvehicle |
| _version_ |
1719458608580657152 |