Development of a Novel Fully Coupled Solver in OpenFOAM: Steady-State Incompressible Turbulent Flows

Mangani, Luca; Buchmayr, Markus; Darwish, M.

doi:10.1080/10407790.2014.894448

Cited by 43 publications

(36 citation statements)

References 7 publications

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“…Also, under-relaxation can be completely avoided using so-called false transient time stepping. The solution of its discretized system of equations therefore turns out to be numerically much more stable than that of segregated algorithms and also significantly faster in terms of calculation time, which has been demonstrated by Mangani et al [8][9][10][11][12]. Therein, a k-ω SST turbulence model has been solved in addition to momentum and continuity equations.…”

Section: Block Coupled Incompressible Cfd Solver: Coupledsteadyincfoamentioning

confidence: 99%

“…In order to overcome these shortcomings, Mangani et al [8][9][10][11][12] developed a block coupled incompressible solver using the open-source CFD library OpenFOAM as programming platform. Therein the algebraic equations resulting from the Navier-Stokes equations are solved simultaneously.…”

Section: Block Coupled Incompressible Cfd Solver: Coupledsteadyincfoamentioning

confidence: 99%

“…Because speed and robustness are very important for CFD software, two solvers based on the C++ OpenFOAM library [7] will be used and compared to a commercial code. The performance of the new fully coupled block solver developed by the University of Lucerne [8][9][10][11][12] and Andritz will be compared to the standard 1.6ext segregated simpleFoam solver and to a commercial code.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

3D Casing-Distributor Analysis for Hydraulic Design Application

Devals

Zhang

Dompierre

et al. 2015

International Journal of Fluid Machinery and Systems

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Nowadays, computational fluid dynamics is commonly used by design engineers to evaluate and compare losses in hydraulic components as it is less expensive and less time consuming than model tests. For that purpose, an automatic tool for casing and distributor analysis will be presented in this paper. An in-house mesh generator and a Reynolds Averaged Navier-Stokes equation solver using the standard k-ω shear stress transport (SST) turbulence model will be used to perform all computations. Two solvers based on the C++ OpenFOAM library will be used and compared to a commercial solver. The performance of the new fully coupled block solver developed by the University of Lucerne and Andritz will be compared to the standard 1.6ext segregated simpleFoam solver and to a commercial solver. In this study, relative comparisons of different geometries of casing and distributor will be performed. The present study is thus aimed at validating the block solver and the tool chain and providing design engineers with a faster and more reliable analysis tool that can be integrated into their design process.

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Section: Block Coupled Incompressible Cfd Solver: Coupledsteadyincfoamentioning

confidence: 99%

Section: Block Coupled Incompressible Cfd Solver: Coupledsteadyincfoamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

3D Casing-Distributor Analysis for Hydraulic Design Application

Devals

Zhang

Dompierre

et al. 2015

International Journal of Fluid Machinery and Systems

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“…One approach to improve the stability is hence to use a slightly stronger coupling such as proposed by e.g. the SIM-PLEC 4 an PISO 5 methods, to use a better preconditioned Schur complement 6,7 or to use a fully coupled formulation 8 . However, the computational cost of these alternatives increases rapidly.…”

Section: Introductionmentioning

confidence: 99%

Stabilisation of Discrete Adjoint Solvers for Incompressible Flow

Wang

Akbarzadeh

Müeller

2015

22nd AIAA Computational Fluid Dynamics Conference

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The pressure-correction equation and its coupling to the momentum equation as used in the popular incompressible approaches such as SIMPLE algorithm often exhibit poor stability and only converge to limit-cycle oscillations. Steady-state discrete adjoint solvers inherit the spectral properties of the flow solver from which they are derived and typically diverge if the flow discretisation is not stable. The paper discusses derivation of the discrete adjoint solver 1 using Automatic Differentiation (AD) and demonstrates the lack of stability of the SIMPLE scheme. An alternative strategy for the coupling of the flow equations is proposed that offers improved stability of the flow solver, as well as its adjoint. Numerical experiments comparing the standard SIMPLE scheme to the new stabilisation technique demonstrate the effectiveness and improved convergence of primal and adjoint system.

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“…The solution of the velocity field and pressure field was conducted through a fully coupled block algorithm. Due to the simultaneous solution of momentum and continuity equations, implicit block coupling of pressure and velocity variables leads to faster convergence with respect to classical, loosely coupled, segregated algorithms of the SIMPLE family of algorithms [21].…”

Section: Governing Equations and Numerical Algorithmmentioning

confidence: 99%

Numerical Research on the Mixture Mechanism of Polluted and Fresh Air at the Staggered Tunnel Portals

Zhang

Zhu

et al. 2018

Applied Sciences

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Abstract:In longitudinal ventilation, circulating air is formed in portals for closely spaced twin tunnels, which causes mixing between the polluted air exhausted from one tunnel and the fresh air flow of another tunnel, thus leading to the rising costs of ventilation system construction and operation. In this study, for the closely spaced tunnel with staggered inlet and outlet, the computational fluid dynamics (CFD) numerical simulation method was adopted to reveal flow characteristics of the circulating air as well as variation rules of the circulating air mixing ratio ϕ c with tunnel structure and operation parameters. Results show that both reducing inlet air velocity and increasing outlet air velocity and lateral distance can reduce the impact of the negative-pressure zone at the tunnel entrance on the jet flow structure at the tunnel exit, thus weakening the circulating air. When the inlet is placed behind or aligned with the outlet (staggered distance ∆l ≤ 0), ϕ c will increase linearly along with the increase of staggered distance; when the inlet is placed before the outlet (∆l > 0), ϕ c will first increase and then decrease with the increase of staggered distance. An expression to predict circulating air mixing ratio was created by sections. The predictions show a good correlation with the measurements and indicate that the front slope gradient of the tunnel portal is also one of the factors affecting the circulating air mixing ratio.

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Development of a Novel Fully Coupled Solver in OpenFOAM: Steady-State Incompressible Turbulent Flows

Cited by 43 publications

References 7 publications

3D Casing-Distributor Analysis for Hydraulic Design Application

3D Casing-Distributor Analysis for Hydraulic Design Application

Stabilisation of Discrete Adjoint Solvers for Incompressible Flow

Numerical Research on the Mixture Mechanism of Polluted and Fresh Air at the Staggered Tunnel Portals

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