Development of a multi-block pressure-based algorithm using mixed interpolation for turbulent flows /
A pressure-based finite element algorithm of the SIMPLER-type is developed using a high-order element formulation. The choice of element stems from the general need to increase the accuracy of cfd algorithms and to provide commonality with other finite element algorithms used in other related engin...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1995.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=742145401&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | A pressure-based finite element algorithm of the SIMPLER-type is developed using a high-order element formulation. The choice of element stems from the general need to increase the accuracy of cfd algorithms and to provide commonality with other finite element algorithms used in other related engineering fields such as heat transfer and mechanical design. The initial part of this work develops a new streamline upwind method for the 8-noded element of the so-called Serendipity family. Upon completion of an extensive effort to document the accuracy and validity of the new method, a 'true' multiblock scheme is adapted to the pressure-based finite element algorithm using an equalorder interpolation for all field variables. Several test cases are performed to show that no discontinuities occur at any inner-boundaries. The renormalization group(mg) theory based high Re k-e model is selected to model turbulence effects. The theory, on which the model is based, is totally reviewed and discussed in detail. During the validation phase of the turbulence model, a convergence problem resulted from the use of quadratic interpolation for all field variables. The problem was solved by reducing the order of interpolation for the velocity and turbulence quantities to be piece-wise bi-linear. This resulted in a unprecedented ntixed-order formulation in which the pressure is interpolated at a higher-order than velocity. Test cases are performed to demonstrate how well the final algorithm models flows with strong adverse pressure gradients and streamline curvature effects. |
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| Item Description: | Vita. "Major Subject: Mechanical Engineering". |
| Physical Description: | xiii, 169 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references. |