A novel pressure-velocity coupling algorithm

Krizmanić, Severino and Virag, Zdravko and Džijan, Ivo (2012) A novel pressure-velocity coupling algorithm. = A novel pressure-velocity coupling algorithm. In: 7th International Congress of Croatian Society of Mechanics, 22-25.05.2012., Zadar, Hrvatska.

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Official URL: https://bib.irb.hr/prikazi-rad?&rad=608083

Abstract

During last two decades research efforts within the field of CFD has been directed to solving physically and computationally more demanding problems, leaving the problem of pressure-velocity coupling in solving Navier-Stokes equations somewhat neglected. Finite volume methods for solving fluid flow problems are mostly based on SIMPLE-like methods. SIMPLE algorithm was originally defined on staggered grids on which it is consistent and physically clear. On collocated grids SIMPLE-like methods require non-physical pressure boundary conditions and use of arbitrary interpolations with a possible negative consequence to the solution accuracy. Their convergence rate strongly relies on method's underrelaxation factors. The theoretical research here presented has led to a new pressure-velocity coupling method - FLOP algorithm (Flux LOoping for Pressure drop) which does not suffer from such drawbacks on collocated grids, nor requires underrelaxation factors and that has a significantly higher convergence rate than SIMPLE-like methods, while keeping the segregated solving procedure. A significantly higher convergence rate and efficiency of the FLOP algorithm is noted, along with independency of No. of iterations on grid size. Due to only physical interpolations used and fulfillment of the continuity equation constraint during the iterative process, the new FLOP algorithm does not require any stabilization procedure. This is opposite to all SIMPLE-like algorithms that require underrelaxation factors for wich optimal values are problem dependent.

Item Type: Conference or Workshop Item (Poster)
Keywords (Croatian): CFD, pressure-velocity coupling algorithm, FLOP algorithm, SIMPLE algorithm
Subjects: TECHNICAL SCIENCE > Mechanical Engineering
Divisions: 1400 Department of fluid mechanics > 1410 Chair of computer fluid mechanics
1400 Department of fluid mechanics > 1420 Chair of environment and construction aerodynamics
Indexed in Web of Science: No
Indexed in Current Contents: No
Date Deposited: 08 Apr 2016 10:45
Last Modified: 05 Jun 2017 11:05
URI: http://repozitorij.fsb.hr/id/eprint/5512

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