CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

Using neural networks for CDF response surfaces

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   October 7, 1999, 23:20
Default Using neural networks for CDF response surfaces
Ali Habibi
Posts: n/a
Hi everybody. Here is my problem: Two disciplines are connected together by two common variables and each one has different number of variables these are my sub systems, in system level I have a function, which should be minimized. I want to use collaborative optimization method for this ultidisciplinary problem. Each of two subsystems has a response table with about 100s of CFD runs. To learn these response surfaces I want to use a neural network with back propagation or genetic algorithm. In each iteration, system level optimizer will give a suggestion for common variables I will go to subsystem with these constants and I will try to minimize the subsystem Function. For optimizing these subsystem I want to use simulated annealing or Genetic algorithm (I don't want to use a gradient base method which needs derivatives) They will ask for value of function in different points these values will come back from Already trained neural networks. Now if anybody has some ideas or advise about this scenario please let me know.I have never used neural networks before. any idea may save time. thank you.
  Reply With Quote

Old   October 8, 1999, 01:05
Default Re: Using neural networks for CDF response surfaces
John C. Chien
Posts: n/a
(1). S. Pierret,"Turbomachinery Blade Design Using a Navier-Stokes Solver and Artificial Neural Network" Journey of Turbomachinery,p-326/Vol. 121, April 1999. (2). There are several problems: I am not familiar with neural network, fluid dynamics problems are very complex, parametric models need to be created to simulate the fluid dynamic problem which may not be the best choice.
  Reply With Quote

Old   October 8, 1999, 11:15
Default Re: Using neural networks for CDF response surfaces
clifford Bradford
Posts: n/a
a lot of people have used neural networks for optimisation. the reference John gave is good. also there is a company called Engineous software( that produces a general optimisation package called iSight. they've published articles using GA and NN for aero optimisation and someone there can give you references to their papers. perhaps the jornals like 'Engineering Optimization' or SIAM's optimization journals have references you can use. if you are at a university you'll find these kinds of references in your engineering or math/comp. sci. libraries
  Reply With Quote

Old   October 8, 1999, 22:56
Default Re: Using neural networks for CFD response surfaces
Zhong Lei
Posts: n/a
Search the online database of AIAA paper by the keyword.

Z. Lei
  Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Neural Networks in CFD??? mayank Main CFD Forum 2 October 23, 2002 11:51
Neural Networks and AMR mayank Main CFD Forum 0 October 20, 2002 10:33

All times are GMT -4. The time now is 18:59.