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Institutional Repository [SANDBOX]
Technical University of Crete
Technical University of Crete
EN
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| URI | http://purl.tuc.gr/dl/dias/4F9B7E7A-59BA-424B-86EA-5F422F3C4B91 | - |
| Identifier | http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=2668674 | - |
| Identifier | https://doi.org/10.1115/IMECE2017-70207 | - |
| Language | en | - |
| Title | Rarefied gas flow analysis of a suborbital shuttle with the academic CFD code Galatea | en |
| Creator | Klothakis Angelos | en |
| Creator | Κλωθακης Αγγελος | el |
| Creator | Lygidakis Georgios | en |
| Creator | Λυγιδακης Γεωργιος | el |
| Creator | Nikolos Ioannis | en |
| Creator | Νικολος Ιωαννης | el |
| Publisher | American Society of Mechanical Engineers | en |
| Content Summary | During the past decade considerable efforts have been exerted for the simulation of rarefied gas flows in a wide range of applications, like the flow over suborbital vehicles, in microelectromechanical systems, etc. Such flows appear to be significantly different from those at the continuum regime, making the Navier-Stokes equations to fail without further amendment. In this study an in-house academic CFD solver, named Galatea, is modified appropriately to account for rarefied gases. The no-slip condition on solid walls is no longer valid, hence, velocity slip and temperature jump boundary conditions are applied instead. Additionally, a second-order accurate slip model has been incorporated, namely, this of Beskok and Karniadakis, increasing the accuracy in the same area but avoiding simultaneously the numerical difficulties, entailed by the computation of the second derivative of slip velocity when complex geometries and unstructured grids are coupled. The proposed solver is validated against rarefied laminar flow over a suborbital shuttle, designed by the Azim UTBM team. The obtained results are compared with those extracted with the parallel open-source kernel SPARTA, which is based on the DSMC method. A satisfactory agreement is reported between the two methodologies, demonstrating the potential of the modified solver to simulate effectively such flows. | en |
| Type of Item | Πλήρης Δημοσίευση σε Συνέδριο | el |
| Type of Item | Conference Full Paper | en |
| License | http://creativecommons.org/licenses/by/4.0/ | en |
| Date of Item | 2018-06-04 | - |
| Date of Publication | 2017 | - |
| Subject | Node-centered finite-volume scheme | en |
| Subject | Rarefied gas flow | en |
| Subject | Suborbital shuttle | en |
| Subject | Velocity slip and temperature jump boundary conditions | en |
| Bibliographic Citation | A. G. Klothakis, G. N. Lygidakis and I. K. Nikolos, "Rarefied gas flow analysis of a suborbital shuttle with the academic CFD code Galatea," in ASME 2017 International Mechanical Engineering Congress and Exposition, 2017. doi: 10.1115/IMECE2017-70207 | en |
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