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Rarefied gas flow analysis of a suborbital shuttle with the academic CFD code Galatea

Klothakis Angelos, Lygidakis Georgios, Nikolos Ioannis

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URIhttp://purl.tuc.gr/dl/dias/4F9B7E7A-59BA-424B-86EA-5F422F3C4B91-
Identifierhttp://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=2668674-
Identifierhttps://doi.org/10.1115/IMECE2017-70207-
Languageen-
TitleRarefied gas flow analysis of a suborbital shuttle with the academic CFD code Galateaen
CreatorKlothakis Angelosen
CreatorΚλωθακης Αγγελοςel
CreatorLygidakis Georgiosen
CreatorΛυγιδακης Γεωργιοςel
CreatorNikolos Ioannisen
CreatorΝικολος Ιωαννηςel
PublisherAmerican Society of Mechanical Engineersen
Content SummaryDuring 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 The no-slip condition on solid walls is no longer valid, hence, velocity slip and temperature jump boundary conditions are applied instead.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 ItemΠλήρης Δημοσίευση σε Συνέδριοel
Type of ItemConference Full Paperen
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2018-06-04-
Date of Publication2017-
SubjectNode-centered finite-volume schemeen
SubjectRarefied gas flowen
SubjectSuborbital shuttleen
SubjectVelocity slip and temperature jump boundary conditionsen
Bibliographic CitationA. 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/IMECE2017-70207en

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