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Paper Information

Journal:   JOURNAL OF APPLIED FLUID MECHANICS (JAFM)   2016 , Volume 9 , Number 5; Page(s) 2527 To 2535.
 
Paper: 

AUTOMATED DIFFUSER SHAPE OPTIMIZATION BASED ON CFD SIMULATIONS AND SURROGATE MODELING

 
 
Author(s):  DEHGHANI M., AJAM H.*, FARAHAT S.
 
* DEPARTMENT OF MECHANICAL ENGINEERING, FERDOWSI UNIVERSITY OF MASHHAD, MASHHAD, 91775-1111, IRAN
 
Abstract: 

An approach for the optimization of laminar flow in diffusers is presented. The goal in our optimization process is to maximize diffuser performance and, in this way, pressure recovery by optimizing the geometry.
Our methodology is the optimization through wall contouring of a given two-dimensional diffuser length ratio. The developed algorithm uses the CFD software: Fluent for the hydrodynamic analysis and employs surrogate modeling and an expected improvement approach to optimization. The non-uniform rational basic splines (NURBS) are used to represent the shape of diffuser wall with three to nine design variables, respectively. The framework is assisted by the construction of Kriging model, for the management of the problem. The CFD software and the Kriging model have been combined for a fully automated operation using some special control commands on the MATLAB platform. In order to seek a balance between local and global search, an adaptive sample criterion is employed. The optimal design exhibits a reasonable performance improvement compared with the reference design.

 
Keyword(s): PLANAR DIFFUSER, KRIGING SURROGATE MODEL, EXPECTED IMPROVEMENT APPROACH, NUMERICAL SIMULATION, NURBS PARAMETERIZATION
 
References: 
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