Partially averaged Navier-Stokes turbulence modeling : investigation of computational and physical closure issues in flow past a circular cylinder /
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[College Station, Tex.] :
[Texas A&M University],
[2010]
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| Subjects: | |
| Online Access: | Link to OAK Trust copy |
| Abstract: | Partially Averaged Navier-Stokes (PANS) turbulence method provides a closure model for any degree of velocity field filtering - ranging from completely resolved Direct Numerical Simulation (DNS) to completely averaged Reynolds Averaged Navier-Stokes (RANS) method. Preliminary investigations of PANS show promising results but there still exist computational and physical issues that must be addressed.This study investigates the performance of the PANS method for ow past a cylinder at a Reynolds number of 140,000. The cylinder flow is a benchmark flow problem for which there are signicant experimental results available for validation of PANS. First, we examine if RANS convergence criteria and discretization schemes -which are meant for robust, nearly steady-state calculations - are adequate for PANS, which is inherently unsteady and may contain delicate flow features. For the range of fk values tested here, it is determined that the standard RANS residual value and the 2nd order spatial discretization scheme are appropriate for PANS. The physical closure investigations begin with the validation of turbulent transport models: the ZeroTransport Model, the Maximum Transport Model and the Boundary Layer Transport Model. The implementation of the PANS ku-wu model is also performed and compared against the standard PANS ku-ey model. All these studies yield interesting insights into the PANS models. This study concludes with an investigation of a low Reynolds number correction for the PANS ku-wu model which yields excellent improvement. |
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| Item Description: | "Major Subject: Aerospace Engineering" Title from author supplied metadata (automated record created 2010-03-12 12:08:51). Electronic resource. |
| Physical Description: | 1 online resource. |
| Bibliography: | Includes bibliographical references. |