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Optimization using Steepest Descent Algorithm

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Old   February 19, 2015, 06:07
Default Optimization using Steepest Descent Algorithm
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Vibhor pandey
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Hi! I am trying to Optimize the shape of a diffuser in order to reduce the Pressure Drop across it. To do so, I am using Adjoint Flow Solver in STAR CCM+ which gives me the Sensitivities(Gradients, i.e. X,Y and Z Pressure Drop Derivative). I use that data to generate new points using the Steepest Descent Algorithm with the help of a formula Xnew = Xold - (Step Size * X Gradient) and respectively for Y and Z.
The problem which I'm facing is finding the Global Minimum of the Solution. Sometimes the Initial Geometry lies somewhere around the local minimum which doesn't leaves much scope for improvement.
Can anyone please put forward some suggestions?
Thank you!
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adjoint, algorithm, optimization, star ccm+

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