Wavelet-based lossy compression of barotropic turbulence simulation data
J.P. Wilson · 2003
Summary form only given. Data storage issues pose a potential problem in the performance and analysis of turbulence simulations. One tool that has successfully addressed such performance problems in other domains is data compression. Unfortunately, data from turbulence simulations does not usefully compress with lossless methods. In this work, the compression of data from a simulation of barotropic turbulence using wavelet-based lossy coding is examined. The resolution of the data used is 512 by 512. The output of this simulation is the relative vorticity as single precision floating point values. A number of quantities are computed from the relative vorticity. The numerical error in these quantities is evaluated along with visualizations of the vorticity and error correlation with the uncompressed data. It is found that depending on the quantities of interest and the evaluation criteria, compression ratios of 4:1 to 256:1 are achievable. Under a conservative definition of acceptable error, it is possible to recover quantities of interest from data compressed 4:1 (8 bpp), the data rate that in existing practice is used for visualization.