Ιδρυματικό Αποθετήριο
Πολυτεχνείο Κρήτης
Πολυτεχνείο Κρήτης
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| URI | http://purl.tuc.gr/dl/dias/4F9B7E7A-59BA-424B-86EA-5F422F3C4B91 | - |
| Αναγνωριστικό | http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=2668674 | - |
| Αναγνωριστικό | https://doi.org/10.1115/IMECE2017-70207 | - |
| Γλώσσα | en | - |
| Τίτλος | Rarefied gas flow analysis of a suborbital shuttle with the academic CFD code Galatea | en |
| Δημιουργός | Klothakis Angelos | en |
| Δημιουργός | Κλωθακης Αγγελος | el |
| Δημιουργός | Lygidakis Georgios | en |
| Δημιουργός | Λυγιδακης Γεωργιος | el |
| Δημιουργός | Nikolos Ioannis | en |
| Δημιουργός | Νικολος Ιωαννης | el |
| Εκδότης | American Society of Mechanical Engineers | en |
| Περίληψη | 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 The no-slip condition on solid walls is no longer valid, hence, velocity slip and temperature jump boundary conditions are applied instead.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 |
| Τύπος | Πλήρης Δημοσίευση σε Συνέδριο | el |
| Τύπος | Conference Full Paper | en |
| Άδεια Χρήσης | http://creativecommons.org/licenses/by/4.0/ | en |
| Ημερομηνία | 2018-06-04 | - |
| Ημερομηνία Δημοσίευσης | 2017 | - |
| Θεματική Κατηγορία | Node-centered finite-volume scheme | en |
| Θεματική Κατηγορία | Rarefied gas flow | en |
| Θεματική Κατηγορία | Suborbital shuttle | en |
| Θεματική Κατηγορία | Velocity slip and temperature jump boundary conditions | en |
| Βιβλιογραφική Αναφορά | 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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