Kavli Affiliate: Morteza Gharib
| First 5 Authors: Scott A. Bollt, Samuel H. Foxman, Morteza Gharib, ,
| Summary:
We present a novel architecture for accelerating PIV calculations. An optical
flow hardware accelerator does the brunt of the work, with cross-correlation
only providing quick corrections. The result is RapidPIV: a free-to-download
software program for real-time particle image velocimetry (PIV) for Linux and
Windows computers with an Nvidia Turing-gen (or newer) GPU (RapidPIV download
at https://rapidpiv.caltech.edu). Dense vector fields and vorticity can be
displayed in real time when connected to compatible camera. Processing
pre-existing PIV image files is also supported. We achieve 1,150
frames-per-second on 1 megapixel images. Accuracy, repeatability, and
robustness are tested with physical experiments involving an accelerated flat
plate and a cylinder wake. RapidPIV’s accuracy, precision and ability to handle
high displacement, velocity gradients, out-of-plane motion, and low seeding
density compare favorably with the trusted multi-grid correlation software.
However, RapidPIV is a thousand times faster.
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