ISSN 2079-3537      

 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                                                                                             

Scientific Visualization, 2019, volume 11, number 3, pages 103 - 110, DOI: 10.26583/sv.11.3.09

Investigation of free convection in the cubic cave with PIV and POD methods

Authors: D.A. Sergeev1, A.A. Kandaurov2

A Institute of Applied Physics RAS

B Nizhny Novgorod State Technical University n.a. R.E. Alekseev

1 ORCID: 0000-0003-4910-3935 , daniil@appl.sci-nnov.ru

2 ORCID: 0000-0002-0014-8887, green.pb@gmail.com

 

Abstract

Investigations of the flow structure on the benchmark cube under conditions of free convection caused by a vertical temperature gradient are performed using a low cost PIV-measuring system with continuous laser. The obtained velocity fields were processed with POD method to obtain typical structures (modes) in the flow. It is shown that the steady flow can be described by combination of the first three modes. It is demonstrated that only starting with the third mode there is a significant change in the spectra of the amplitude coefficients of the modes, the peak shifts to the region of higher frequencies. Thus accounting for this mode is essential for describing turbulent processes in the system and verification of numerical calculations.

 

Keywords: verification CFD, free convection, velocity fields, PIV, POD.