Pressure–velocity coupling algorithm-based pressure reconstruction from PIV for laminar flows

Gunaydinoglu, Erkan; Kurtuluş, Dilek Funda

doi:10.1007/s00348-019-2831-1

Cited by 16 publications

(8 citation statements)

References 33 publications

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“…(2) for the pressure. Many approaches have been explored over the years, from direct integration using finite differences methods to complete implementations of CFD solvers like SIMPLE or PISO, where both the pressure and the velocity fields are calculated and corrected in an iterative process (Gunaydinoglu and Kurtulus, 2020;Regert et al, 2011).…”

Section: Numerical Solver In Openfoam®mentioning

confidence: 99%

“…Standard techniques from CFD (Computational Fluid Dynamics) offers powerful and efficient tools to compute pressure fields from velocity fields (Gunaydinoglu and Kurtulus, 2020;Regert et al, 2011). However, the main challenge in the use of these tools is that PIV fields are generally noisy and available on grids that are often too coarse to reproduce accurately curved boundaries.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on computed pressures from PIV, a study of how boundary definitions affect pressure accuracy along objects on the example of a cylinder flow.

Felis-Carrasco¹,

Hess²,

Watz³

et al. 2021

ISPIV21

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This work discusses an approach to compute pressure fields from planar PIV measurement using standard CFD tools. In particular, we propose a combination of interpolation and mesh adaptation to import the PIV measurements on a grid that is morphed around objects, and is fine enough to solve the Poisson equation accurately. The whole process of meshing, interpolation and pressure computation is carried out using the popular open-source solver OpenFoam®. The method is tested and validated on a classic benchmark test case, namely, the unsteady flow past a cylinder. A 3D multiphase flow simulation is used to generate the reference data and analyze the impact of both, the PIV interrogation and the interpolation on the morphed grid. The simulation uses an Euler-Lagrangian one-way coupling approach to simulate the flow field and the dynamics of seeding particles. The analysis compares the pressure field from the 3D CFD simulation with the solution of a 2D Poisson equation based on the 2D velocity field obtained by either down-sampling the CFD data or by PIV interrogation of synthetic images built from the CFD data. Finally, we challenge the proposed method with the pressure reconstruction in a TR-PIV experiment in similar conditions.

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Section: Numerical Solver In Openfoam®mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on computed pressures from PIV, a study of how boundary definitions affect pressure accuracy along objects on the example of a cylinder flow.

Felis-Carrasco¹,

Hess²,

Watz³

et al. 2021

ISPIV21

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show abstract

“…[25] extracted pressure fields from two-dimensional PIV snapshots using the SIMPLER algorithm on a non-staggered grid for laminar, incompressible and steady flow, whereas ref. [26] computed pressure from two-dimensional PIV data for incompressible, laminar steady and unsteady flows. Therefore, the novelty characterising the present research is its application to a turbulent flow with direct computation of Reynolds stresses from the PIV statistics and their inclusion in the source terms of the Reynolds-averaged Navier-Stokes (RANS) equations.…”

Section: Introductionmentioning

confidence: 99%

Calculation of the Pressure Field for Turbulent Flow around a Surface-Mounted Cube Using the SIMPLE Algorithm and PIV Data

Pallas

Bouris

2022

Fluids

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The calculation of the pressure field on and around solid bodies exposed to external flow is of paramount importance to a number of engineering applications. However, conventional pressure measurement techniques are inherently linked to problems principally caused by their point-wise and/or intrusive nature. In the present paper, we attempt to calculate a time-averaged two-dimensional pressure field by integrating PIV (particle image velocimetry) velocity measurements into a CFD code and modifying them by the respective correction step of the SIMPLE algorithm. Boundary conditions are applied from the PIV data as a three-layer area of constant velocities adjacent to the boundaries. A novel characteristic of the approach is the straightforward inclusion of the Reynolds stresses into the source terms of the momentum equations, calculated directly from the PIV statistics. The methodology is applied to three regions of the symmetry plane parallel to the main boundary layer flow past a surface-mounted cube. In spite of findings of deviations from the planar 2D flow assumption, the derived pressure fields and the adjusted velocity fields are found to be reliable, while the intrinsic turbulent nature of the flow is considered without modelling the Reynolds stresses.

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“…Another approach aiming at the integration of PIV data and at the same time at the reconstruction of the respective pressure field consists of SIMPLE-based methods where the boundary conditions of the velocity are constructed from PIV data. To the authors' knowledge, only two other attempts following the latter reasoning can be distinguished: [21] extracted pressure fields from two-dimensional PIV snapshots using the SIMPLER algorithm on a non-staggered grid for laminar, incompressible and steady flow, whereas [22] computed pressure from two-dimensional PIV data, for incompressible, laminar steady and unsteady flows. Therefore, the novelty characterising the present research is the application to a turbulent flow with direct computation of Reynolds Stresses from the PIV statistics and their inclusion in the source terms of the Reynolds-Averaged Navier-Stokes (RANS) equations.…”

Section: Introductionmentioning

confidence: 99%

Calculation of the Pressure Field for Turbulent Flow Around a Surface Mounted Cube Using the SIMPLE Algorithm and PIV Data

Pallas¹,

Bouris²

2022

Preprint

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Calculation of the pressure field on and around solid bodies exposed to external flow is of paramount importance to a number of engineering applications. However, conventional pressure measurement techniques are inherently linked to problems principally caused by their point-wise and/or intrusive nature. In the present paper, we attempt to calculate the time-averaged two-dimensional pressure field by integrating PIV (Particle Image Velocimetry) velocity measurements into a CFD code and modifying them by the respective correction step of the SIMPLE algorithm. Boundary conditions are applied from the PIV data as a three-layer area of constant velocities, adjacent to the boundaries. A novel characteristic of the approach is the straightforward inclusion of the Reynolds Stresses into the source terms of the momentum equations, calculated directly from the PIV statistics. The methodology is applied to three regions of the symmetry plane parallel to the main boundary layer flow past a surface mounted cube. In spite of findings of deviations from the planar 2D flow assumption, the derived pressure fields and the adjusted velocity fields are found to be reliable, while the intrinsic turbulent nature of the flow is considered without modelling of the Reynolds stresses.

show abstract

Pressure–velocity coupling algorithm-based pressure reconstruction from PIV for laminar flows

Cited by 16 publications

References 33 publications

Investigation on computed pressures from PIV, a study of how boundary definitions affect pressure accuracy along objects on the example of a cylinder flow.

Investigation on computed pressures from PIV, a study of how boundary definitions affect pressure accuracy along objects on the example of a cylinder flow.

Calculation of the Pressure Field for Turbulent Flow around a Surface-Mounted Cube Using the SIMPLE Algorithm and PIV Data

Calculation of the Pressure Field for Turbulent Flow Around a Surface Mounted Cube Using the SIMPLE Algorithm and PIV Data

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