OPENFOAM-EXPLORATION OF DIGITAL-FILTER-BASED SYNTHETIC TURBULENCE GENERATION METHODS AND AN IMPROVEMENT TO THEIR NON-GAUSSIAN CAPABILITIES

The aims of this research study are i. to systematically explore patterns in parameters-mechanisms of digital-filter-based synthetic turbulence generation methods (DFM) to fill a number of significant knowledge gaps, and ii. to add non-parametric non-Gaussian turbulence realization generation capability into DFM.

Four DFM were implemented into OpenFOAM suite and tested through a test-bed. The methods sorted by descending computational cost are: i. di Mare et al., ii. Klein et al., iii. Xie-Castro and iv. Kim et al. The chosen methods represent the majority of DFM capabilities and varieties. The test-bed involves three 'building-block' flows: i. homogeneous isotropic turbulence, ii. homogeneous shear turbulence, and iii. plane channel flow, each of which focuses on an isolated aspect of turbulent flows.

The following remains incomplete to reach the two aims of the study: i. prospective simulations of the test scenarios need to be completed, and ii. the method-yielding-promising-results for non-Gaussian functionality needs to undergo a formalization, and more extensive-various tests.