A model for modifying the S-N curve considering the effect of boundary conditions on the fatigue crack growth of welded components

The present study proposes a novel model to modify master S-N curves of components according to their load redistribution capability reflected in different boundary conditions (BCs) based on the fracture mechanics analysis. To that end, a comprehensive numerical study was conducted on a Single Edge Notch Bend (SENB) specimen constrained with...

Mechanisms governing carbon and nitrogen pathways during enhanced waste degradation in landfill simulator reactors

Nitrogen undergoes multiple biogeochemical transformations during waste degradation, which depend on speciation, prevailing geochemical boundary conditions, and waste surface properties. This study developed a waste biodegradation model with high flexibility in accommodating reaction pathways to assess different process dynamics. The model was...

Plan of approach SBW wind modelling

This report presents the joint KNMI and Deltares Plan of Approach for the wind modelling activities for the coming years, with the goal to determine time and spatially varying extreme wind fields. These are required as input for the 2017 safety assessment of the primary water defences. The objectives of the project have been defined as follows:...

Hydraulische Randvoorwaarden primaire waterkeringen

Beschrijft de berekeningsmethoden en uitgangspunten die ten grondslag liggen aan de hydraulische randvoorwaarden en geeft voor elk dijkringgebied de hoogwaterstanden (de zogenaamde toets- en rekenpeilen). Voor de zee en estuaria zijn ook de golfrandvoorwaarden opgenomen. Errata toegevoegd met name voor de Maas.

Limitations to upscaling of groundwater flow models dominated by surface water interaction

Different upscaling methods for groundwater flow models are investigated. A suite of different upscaling methods is applied to several synthetic cases with structured and unstructured porous media. Although each of the methods applies best to one of the synthetic cases, no performance differences are formed if the methods were applied to a real...

Non reflecting boundary conditions for reacting flows

In this paper we explore the specification of time dependent boundary conditions suitable for the simulation of low Mach number reacting flows. The standard treatments used to date are based on the method of characteristics, and essentially set to zero the incoming characteristics; this practise has been shown to have deleterious effects on the...

Numerical schemes for compressible flow with all Mach numbers

This work is concerned with the numerical solution of an inviscid compressible flow. Our goal is to develop a sufficiently accurate and robust method allowing the solution of problems with a wide range of Mach numbers. The main ingredients are the discontinuous Galerkin finite element method (DGFEM), semi-implicit time stepping, special...

A numerical investigation of the boundary commutation error in large eddy simulation

The boundary commutation error in large eddy simulation is studied numerically. It is shown that an accurate representation of the boundary commutation error has an important role in a reliable large eddy simulation of wall bounded flows. The numerical experiments in this paper are conducted for a 2D channel flow.

Hydraulische randvoorwaarden 2001 voor het toetsen van primaire waterkeringen

Beschrijft de berekeningsmethoden en uitgangspunten die ten grondslag liggen aan de hydraulische randvoorwaarden en geeft voor elk dijkringgebied de hoogwaterstanden (de zogenaamde toets- en rekenpeilen). Voor de zee en estuaria zijn ook de golfrandvoorwaarden opgenomen. Op de bijgeleverde CD-ROM staat het PC-programma Hydra 2001. Hiermee is het...

The feasibility of implementing radiating boundary conditions in Triwaq

This report describes a method for radiating disturbances generated in the computational field through the radiating boundaries. First a simulation is made without disturbances (such as a storm surge) subsequently a second simulation is made with the radiating boundary conditions activated, and the disturbance is able to pass through the...

Hydraulische randvoorwaarden voor primaire waterkeringen

Beschrijft de berekeningsmethoden en uitgangspunten die ten grondslag liggen aan de hydraulische randvoorwaarden en geeft voor elk dijkringgebied de hoogwaterstanden (de zogenaamde toets- en rekenpeilen). Voor de zee en estuaria zijn ook de golfrandvoorwaarden opgenomen.

Experiments and computations on unsteady separating flow in an expanding flume

An unsteady, separating flow with a free surface was investigated with a physical model and a numerical model. To simulate tidal flow, the prescribed flow rate at the inflow boundary was a half-period sine function of time. Measurements of velocities and wave heights were conducted by using LDV and a wave-height meter in a straight open channel...

On the propagation of a disturbance in the bed composition of an open channel

The transport of a sand mixture is more complicated than that of uniform sand, because the transport velocity of a grain is varying with the grain size. And in case of sand mixture, the change of composition of mixture in addition to the change of bed height according to the change of boundary conditions occurs. It is very important from the...