Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
On the Outflow Boundary Conditions for Subsonic Rarefied External Flows
Date
2012-07-13
Author
Çelenligil, Mehmet Cevdet
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
85
views
0
downloads
Cite This
The effects of outflow boundary conditions are investigated on subsonic external flows in the transitional regime. Calculations have been performed for two-dimensional flows over a finite flat plate using the direct simulation Monte Carlo method, concentrating on Knudsen numbers of 0.02 and higher. At the outflow boundaries, the incoming molecules are determined by using a model which adjusts the outflow boundary conditions according to the local rarefaction assuming equilibrium. The results show sensitivity to the model at low Mach numbers but as the speed increases the sensitivity decreases. The effects of domain size, sample size and doing the extrapolations from the adjacent boundary cells rather than following the streamline trajectories are shown.
Subject Keywords
Subsonic outflow boundary conditions
,
External rarefied flows
,
Bridging formula
,
DSMC
URI
https://hdl.handle.net/11511/41561
DOI
https://doi.org/10.1063/1.4769590
Collections
Department of Aerospace Engineering, Conference / Seminar
Suggestions
OpenMETU
Core
Rarefaction Effects on the Outflow Boundary Conditions for External Subsonic Flows
Çelenligil, Mehmet Cevdet (2008-07-25)
In continuum-flow simulations, subsonic outflow boundary conditions are controlled solely by the Mach number. Such boundary conditions are not suitable for rarefied flows, and it is necessary to include the Knudsen number into them. In the present study, this is done for external flows, by introducing a simple model which adjusts the macroscopic boundary properties (from which the incoming molecules are calculated) according to the local rarefaction. A bridging formula is used between the continuum and free...
Investigation of the groundwater modelling component of the Integrated Water Flow Model (IWFM)
Ercan, Ali; Dogrul, Emin C.; Kadir, Tariq N. (2016-01-01)
The Integrated Water Flow Model (IWFM), developed by the California Department of Water Resources, is an integrated hydrological model that simulates key flow processes including groundwater flows, streamflow, stream-aquifer interactions, rainfall-runoff and infiltration. It also simulates the agricultural water demand as a function of soil, crop and climatic characteristics, as well as irrigation practices, and allows the user to meet these demands through pumping and stream diversions. This study investig...
An investigation of liquefaction effects on piers and piles of segmental precast balanced cantilever bridges
Gündüz, Özer; Caner, Alp; Department of Earthquake Studies (2019)
In this thesis, the seismic behavior of a typical segmental precast balanced cantilever bridge over liquefiable soils is investigated. Liquefaction is a phenomenon that is triggered by large movements of the sand layer during earthquakes and cause damage to structures. The subject is still under investigation, approaches for liquefaction induced lateral spreading calculations can be found in the literature. Inertial and kinematic effects of the lateral spreading were studied with a total of four different a...
Evaluation of the Ground Motion Scaling Procedures for Concrete Gravity Dams
SOYSAL, BERAT FEYZA; Ay, Bekir Özer; Arıcı, Yalın (Elsevier BV; 2017-09-13)
The seismic safety of dam structures is often evaluated using time history analyses conducted with a limited number of ground motions. The selection and scaling of the ground motions is usually the most effective factor determining the results of the safety assessment. The inherent variability in the ground motion as well as the difficulty of conducting the analyses for a large number of ground motions renders the selection as the most important factor in the analysis results. The guidelines for the nonline...
ON THE EFFECTS OF INFLOW CONDITIONS ON THE WAKE OF WIND TURBINE MODELS AND POROUS DISCS
Hassanein, Abdelrahman Hisham Ahmed Sabri; Perçin, Mustafa; Department of Aerospace Engineering (2023-1-18)
The study investigates the effect of two inflow conditions on the wake of a model wind turbine, namely, homogenous isotropic turbulence intensity and streamwise gust. For the effect of the freestream turbulence intensity, the wake of a porous disc with a comparable thrust coefficient was used to further highlight the differences in their wakes and decay characteristics. Results show that the wake of a wind turbine model has a faster decay rate than porous discs under both freestream turbulence intensities. ...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
M. C. Çelenligil, “On the Outflow Boundary Conditions for Subsonic Rarefied External Flows,” 2012, vol. 1501, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/41561.