Category
Poster - Basic
Description
Direct Numerical Simulation (DNS) is an invaluable tool for visualizing turbulent structures down to the smallest length scales. Because of the large element count necessary to resolve these small structures, DNS is typically performed using high-order spectral methods. While these methods greatly ease the computational burden, they preclude the use of unstructured meshes, which are often a necessity to model complex geometry. Finite-volume methods enable the use of unstructured meshes at great computational cost. Existing literature has validated DNS using various finite-volume solvers, but the commercial solver ANSYS Fluent remains unvalidated. We demonstrate preliminary attempts to validate DNS of a low-Reynolds number (〖"Re" 〗_τ=180) channel flow using ANSYS Fluent. Four meshes are examined with cell count from 8 million to 67 million elements. We compare energy spectra, Reynolds stress profiles, and Reynolds stress budgets, paying close attention to the aberrant “pile-up” of energy at large wavenumbers.
Validation of ANSYS Fluent for Direct Numerical Simulation of Channel Flow
Poster - Basic
Direct Numerical Simulation (DNS) is an invaluable tool for visualizing turbulent structures down to the smallest length scales. Because of the large element count necessary to resolve these small structures, DNS is typically performed using high-order spectral methods. While these methods greatly ease the computational burden, they preclude the use of unstructured meshes, which are often a necessity to model complex geometry. Finite-volume methods enable the use of unstructured meshes at great computational cost. Existing literature has validated DNS using various finite-volume solvers, but the commercial solver ANSYS Fluent remains unvalidated. We demonstrate preliminary attempts to validate DNS of a low-Reynolds number (〖"Re" 〗_τ=180) channel flow using ANSYS Fluent. Four meshes are examined with cell count from 8 million to 67 million elements. We compare energy spectra, Reynolds stress profiles, and Reynolds stress budgets, paying close attention to the aberrant “pile-up” of energy at large wavenumbers.
Comments
Doctorate - 1st Place Award Winner