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FINE™/Design3D is used to optimize the aerodynamics performances of a centrifugal compressor wheel pre-designed with FINE/Agile™.
The blades count and shape are automatically varied to maximize the total-to-total efficiency.
The compressor efficiency has increased by almost 2% without re-fitting or conversion of the preliminary design geometry. All this in less than 4 hours on a standard workstation.
Yannick Baux, Head of Turbomachinery, NUMECA International.
OPTIMIZATION SETUP DEFINITION
DESIGN OF EXPERIMENTS POPULATION
The number of samples computed to build the DoE is kept minimal, one CFD run per free parameter. The full database computation requires no more than half an hour on a standard workstation (12 cores). Advanced data analysis tools allow verifying the accuracy of the surrogate model.
Fill the Design of Experiments
Evaluate the accuracy of the surrogate model: Leave-One-Out
OPTIMUM SEARCH (SEQUENTIAL)
Sequential search: minimum number of runs to reach the optimum design.
One candidate per design iteration
Best design 93:
78 sequential runs in the search
CPU time = 27.8 CPU.h
Turnaround time = 7h on 4 cores
OPTIMUM SEARCH (PARALLEL)
Parallel search: one point evaluate the optimum while the others explore the design space to minimize the turnaround time.
Three candidates per design iteration
One point evaluate the optimum, the others explore.
Best Design 137:
128 runs in the search
3 processed in parallel
CPU time = 41.7 CPU.h
Turnaround time = 3h30min
ANALYSIS OF VARIANCE ANOVA
Which parameters have the most influence?
|Efficiency raise of +1,8%|
In less than 4 hours on a standard workstation, you have increased the efficiency of your preliminary design by almost 2%.