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https://hdl.handle.net/123456789/1527| Τύπος: | Ανακοίνωση σε συνέδριο |
| Τίτλος: | Prediction of turbulent axisymmetric flows using an artificial compressibility approach |
| Συγγραφέας: | [EL] Λυγιδάκης, Γεώργιος[EN] Lygidakis, Georgios [EL] Λελούδας, Σταύρος[EN] Leloudas, Stavros [EL] Δελής, Ανάργυρος[EN] Delis, Anargiros [EL] Νικολός, Ιωάννης[EN] Nikolos, Ioannis |
| Ημερομηνία: | Σεπ-2020 |
| Περίληψη: | Swirling flows are revealed to be of crucial importance across a wide range of engineering applications. Especially in the field of turbomachines; the ability to efficiently predict the characteristics of such flows has a significant impact on their design. Motivated by the previous state, the in-house academic solver IGal2D is presented in this study, that has been recently enhanced to simulate swirling incompressible flows. Flow modeling is based on the modified, by the artificial compressibility approach, axisymmetric Reynolds- Averaged Navier-Stokes equations (including tangential velocity) and Shear Stress Transport turbulence model, expressed in cylindrical coordinates. Discretization is achieved via two-dimensional hybrid unstructured grids, composed of triangular and quadrilateral elements, along with a node-centered finite-volume scheme. For the computation of inviscid fluxes, the Roe approximate Riemann solver is implemented, coupled with a higher-order accurate spatial scheme, whereas for viscous ones the required gradients are evaluated with an element-based approach. Time integration is succeeded through the secondorder temporal accurate four-stage Runge-Kutta method. For the improvement of its computational performance an agglomeration multigrid scheme is utilized along with an edge-based data structure and a local time-stepping technique. The proposed solver is validated against relevant challenging test cases considering inviscid and viscous, laminar and turbulent, flows. The extracted results are compared with those of the commercial software ANSYS Fluent, confirming the proposed methodology’s potential to predict such flows in terms of accuracy. |
| Γλώσσα: | Αγγλικά |
| Τόπος δημοσίευσης: | Χανιά, Κρήτη, Ελλάδα |
| Σελίδες: | 8 |
| DOI: | 10.33737/gpps20-tc-98 |
| ISSN: | 2504-4400 |
| Θεματική κατηγορία: | [EL] Αεροδιαστημική μηχανική[EN] Aerospace Engineering |
| Λέξεις-κλειδιά: | Computational Fluid Dynamics; Axisymmetric flows; Turbulent flows |
| Κάτοχος πνευματικών δικαιωμάτων: | © The Author(s) 2020 |
| Όροι και προϋποθέσεις δικαιωμάτων: | This work is licensed under Attribution-NonCommercial-NoDerivatives 4.0 International (CC-BY-NC-ND). See: https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode |
| Ηλεκτρονική διεύθυνση του τεκμηρίου στον εκδότη: | https://gpps.global/wp-content/uploads/2021/02/GPPS-TC-2020_ANMM_98.pdf |
| Ηλεκτρονική διεύθυνση περιοδικού: | https://gpps.global/chania20-proceedings/ |
| Τίτλος πηγής δημοσίευσης: | Proceedings of Global Power and Propulsion Society ISSN-Nr: 2504-4400 GPPS Chania20 7th – 9th September, 2020 |
| Σελίδες τεκμηρίου (στην πηγή): | Article no GPPS-CH-2020-0098 |
| Όνομα εκδήλωσης: | GPPS Chania20 |
| Τοποθεσία εκδήλωσης: | Chania, Greece |
| Ημ/νία έναρξης εκδήλωσης: | 07/09/2020 |
| Ημ/νία λήξης εκδήλωσης: | 09/09/2020 |
| Σημειώσεις: | This research has been financed by the Operational Program “Human Resources Development, Education and Lifelong Learning 2014-2020” and is co-financed by the European Union and Greek national funds (MIS: 5047362). |
| Εμφανίζεται στις συλλογές: | Ερευνητικές ομάδες |
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