Quasi-DNS capabilities of OpenFOAM for different mesh types

Direct numerical simulation of strongly heated air flow in a vertical pipe

“…OpenFOAM has been applied for DNS by various authors [14][15][16]. The DNS suitability was tested by Komen et al [14] on simple pipe-and channel flows with Re s up to 395 based on channel half height/pipe radius.…”

“…The DNS suitability was tested by Komen et al [14] on simple pipe-and channel flows with Re s up to 395 based on channel half height/pipe radius. Although it is called as (quasi-) DNS in the first place, it was observed that when hexahedral meshes are used, the differences between the OpenFOAM and the reference DNS solutions are actually the same as the mutual differences between these different reference DNS solutions.…”

Quasi-DNS of natural convection flow in a cylindrical annuli with an optimal polyhedral mesh refinement

“…Furthermore, the absence of a detailed reference data and recent demonstrations that unstructured finite-volume codes can be used for quasi direct numerical simulations [13,14] has motivated the present numerical study using the STAR-CCM+ code (CD-adapco) to provide detailed and additional reference data for the Verification and Validation (V&V) of the existing RANS turbulence models. Prior to the cavity simulation, a DNS mode validation test case for the code and schemes has been performed by simulating the well-known turbulent channel flow at Re s ¼ 395 [15].…”

Numerical investigation using an exact solution of the effects of non-solenoidality of the viscous terms on the incompressible flow

“…LES is a useful method for solving fluid problems in engineering applications, although the computational cost of direct numerical simulation (DNS) may be prohibitively large. Recently, Quasi-DNS has been proposed (Komen et al, 2014;Addad et al, 2015) as a method that is intermediate between DNS and LES; this kind of LES uses finite-difference approximations. Fractional step methods (e.g., Kim and Moin, 1985) are commonly used in simulations for incompressible flows, and they require solving the Poisson equation.…”