A numerical and experimental investigation of the effect of side walls on hydrodynamic model testing in a wave flume

Xie, Nan; Hann, Martyn; Pemberton, Richard; Iglesias, G.; Greaves, Deborah

doi:10.1016/j.oceaneng.2019.06.013

Cited by 10 publications

(4 citation statements)

References 21 publications

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“…The ITZ can be observed around the aggregates in scanning electron microscopy. Due to, e.g., wall effect [17,22], microbleeding [23] and one-sided growth of hydrated products [24], the ITZ is characterized by high porosity. In the ITZ there is a local mismatch of elastic modulus [25] and stress concentrations due to mechanical loads and restrained deformations (due to, e.g., drying [26,27] and autogenous shrinkage [28,29]) that may lead to cracking.…”

Section: A Precise Knowledge Of the Microstructure Of Concrete Is Ess...mentioning

confidence: 99%

Areal analysis induced bias on interface thickness around ovoidal particles

Chen

Lin

et al. 2020

Construction and Building Materials

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Section: A Precise Knowledge Of the Microstructure Of Concrete Is Ess...mentioning

confidence: 99%

Areal analysis induced bias on interface thickness around ovoidal particles

Chen

Lin

et al. 2020

Construction and Building Materials

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“…benefits, the numerical model was up as an 2D-vertical (2DV) model. In the physical test, the side walls the Delta flume create friction, which leads to 3D effects [34]. This means that the velocity in the of the flume might be than near the walls the flume.…”

Section: Towards Improved Modelling Of Porous Dike Revetmentsmentioning

confidence: 99%

Hydrodynamic Modelling of Wave Overtopping over a Block-Covered Flood Defence

Barendse

Bergeijk

Chen

et al. 2022

JMSE

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Wave overtopping can cause erosion on the landward slope due to high flow velocities and turbulence that cause high stresses on the cover. Innovative block revetments such as Grassblocks protect the subsoil of the dike against erosion. The blocks are permeable, which reduces the flow velocity and the pressures along the landward slope. The performance of these blocks is assessed in physical tests, which provides insights into the stability of the blocks. However, such experiments are expensive and accurate measurements are difficult due to highly turbulent conditions. Therefore, the goal of this study is to determine the hydrodynamic conditions at the dike cover caused by the wave run-up on the seaward slope and by the overtopping flow over the crest and landward slope. The geometry and wave conditions from the physical test at the Deltares Delta flume are implemented in an OpenFOAM® numerical model. Using the porousWaveFoam solver, a porous layer on the crest and landward slope is implemented, where the flow resistance of this porous layer largely depends on the resistance coefficients α [-] and β [-]. The numerical model is calibrated based on resistance coefficients as introduced earlier in the literature, which showed that the resistance coefficients of α=500 and β=2.0 performed best for the peak flow velocities and the peak pressures. The numerical model is evaluated by using these resistance coefficients in other time series of the physical tests. The evaluated model is then used to determine the hydrodynamic conditions on the landward slope, which showed that the pressure was the most influential hydrodynamic condition at the time of failure. Finally, the model showed that a porosity of n=0.6 and the porous layer thickness η=36 mm reduced the peak pressure the most.

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“…Finally, to calculate the centroid C(x,ȳ) of each contour inside a ROI, the coordinates x and ȳ are, respectively, calculated by the expressions (8) and (9), which describe the first moment of area.…”

Section: Water Surface Measurementsmentioning

confidence: 99%

“…Measuring the water surface elevations in two-dimensional (2D) hydrodynamic experiments is of importance in several types of studies regarding coastal [1][2][3][4][5] and ocean [6][7][8][9][10] engineering applications. The main reason is that they are very useful in the development of analytical and numerical approaches, particularly for validation purposes.…”

Section: Introductionmentioning

confidence: 99%