Optimization of Hydraulic Machinery Bladings by Multilevel CFD Techniques
The numerical design optimization for complex hydraulic machinery bladings requires a high number of design parameters and the use of a precise CFD solver yielding high computational costs. To reduce the CPU time needed, a multilevel CFD method has been developed. First of all, the 3D blade geometry...
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| Format: | Article |
| Language: | English |
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Wiley
2005-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/IJRM.2005.161 |
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| author | Susanne Thum Rudolf Schilling |
| author_facet | Susanne Thum Rudolf Schilling |
| author_sort | Susanne Thum |
| collection | DOAJ |
| description | The numerical design optimization for complex hydraulic machinery bladings requires a high number of design parameters and the use of a precise CFD solver yielding high computational costs. To reduce the CPU time needed, a multilevel CFD method has been developed. First of all, the 3D blade geometry is parametrized by
means of a geometric design tool to reduce the number of design parameters. To keep geometric accuracy, a special B-spline modification technique has been developed. On the first optimization level, a quasi-3D Euler code (EQ3D) is applied. To guarantee a sufficiently accurate result, the code is calibrated by a Navier-Stokes recalculation of the initial design and can be recalibrated after a number of optimization steps by another Navier-Stokes computation. After having got a convergent solution, the optimization process is repeated on the second level using a full 3D Euler code yielding a more accurate flow
prediction. Finally, a 3D Navier-Stokes code is applied on the third level to search for the optimum optimorum by means of a fine-tuning of the geometrical parameters. To show the potential of the developed optimization system, the runner blading of a water turbine having a specific speed nq=411/min was optimized applying the multilevel approach. |
| format | Article |
| id | doaj-art-ae20949f23c14b12813689f116a40818 |
| institution | Kabale University |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2005-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-ae20949f23c14b12813689f116a408182025-02-03T01:02:39ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342005-01-012005216116710.1155/IJRM.2005.161Optimization of Hydraulic Machinery Bladings by Multilevel CFD TechniquesSusanne Thum0Rudolf Schilling1Institute of Hydraulic Machinery and Plants, University of Technology Munich (TUM), Garching, Munich 85748, GermanyInstitute of Hydraulic Machinery and Plants, University of Technology Munich (TUM), Garching, Munich 85748, GermanyThe numerical design optimization for complex hydraulic machinery bladings requires a high number of design parameters and the use of a precise CFD solver yielding high computational costs. To reduce the CPU time needed, a multilevel CFD method has been developed. First of all, the 3D blade geometry is parametrized by means of a geometric design tool to reduce the number of design parameters. To keep geometric accuracy, a special B-spline modification technique has been developed. On the first optimization level, a quasi-3D Euler code (EQ3D) is applied. To guarantee a sufficiently accurate result, the code is calibrated by a Navier-Stokes recalculation of the initial design and can be recalibrated after a number of optimization steps by another Navier-Stokes computation. After having got a convergent solution, the optimization process is repeated on the second level using a full 3D Euler code yielding a more accurate flow prediction. Finally, a 3D Navier-Stokes code is applied on the third level to search for the optimum optimorum by means of a fine-tuning of the geometrical parameters. To show the potential of the developed optimization system, the runner blading of a water turbine having a specific speed nq=411/min was optimized applying the multilevel approach.http://dx.doi.org/10.1155/IJRM.2005.161 |
| spellingShingle | Susanne Thum Rudolf Schilling Optimization of Hydraulic Machinery Bladings by Multilevel CFD Techniques International Journal of Rotating Machinery |
| title | Optimization of Hydraulic Machinery Bladings by Multilevel CFD Techniques |
| title_full | Optimization of Hydraulic Machinery Bladings by Multilevel CFD Techniques |
| title_fullStr | Optimization of Hydraulic Machinery Bladings by Multilevel CFD Techniques |
| title_full_unstemmed | Optimization of Hydraulic Machinery Bladings by Multilevel CFD Techniques |
| title_short | Optimization of Hydraulic Machinery Bladings by Multilevel CFD Techniques |
| title_sort | optimization of hydraulic machinery bladings by multilevel cfd techniques |
| url | http://dx.doi.org/10.1155/IJRM.2005.161 |
| work_keys_str_mv | AT susannethum optimizationofhydraulicmachinerybladingsbymultilevelcfdtechniques AT rudolfschilling optimizationofhydraulicmachinerybladingsbymultilevelcfdtechniques |