Development of numerical algorithms for end-user applications in aerospace

In this paper, a cross-section of numerical algorithm development at NLR for end-user applications in aerospace is presented. Aerospace is characterized by high safety requirements and standards, complex development programs and operational processes, and challenging multi-physics phenomena. An example is the certification or qualification of...

Full wave analysis of the influence of the jet engine air intake on the radar signature of modern fighter aircraft

Radar cross section prediction techniques are used to determine the radar signature of a military platform when the radar signature can not be determined experimentally, because the platform is not available or for reasons of time and cost. For classic jet aircraft the radar cross section for forward observation angles is dominated by the...

A study of grid convergence issues for the simulation of the massively separated flow around a stalled airfoil using DES and related methods

A systematic grid convergence study is conducted for the Detached-Eddy Simulation (DES) of the massively separated flow around a NACA0021 airfoil at high angle of attack. In order to study the convergence characteristics of DES/LES problems, velocity fields using a series of grids must be generated that demonstrate sufficient dynamic similarity...

Space-Time Discontinuous Galerkin Method for the Compressible Navier-Stokes

An overview is given of a space-time discontinuous Galerkin finite element method for the compressible Navier-Stokes equations. This method is well suited for problems with moving (free) boundaries which require the use of deforming elements. In addition, due to the local discretization, the space-time discontinuous Galerkin method is well...

Space-time discontinuous Galerkin finite element method with dynamic grid motion for inviscid compressible flows - Efficient flux quadrature

A new and efficient quadrature rule for the flux integrals arising in the space-time discontinuous Galerkin discretization of the Euler equations in a moving and deforming space-time domain is presented and analyzed. The quadrature rule is a factor three more efficient than the commonly applied quadrature rule and does not affect the local...

Multitlme multlgrid convergence acceleration for periodic problems with future applications to rotor simulations

The simulation of certain time-dependent flow phenomena can pose a grand challenge to Computational Fluid Dynamics. In this paper, a multitime multigrid convergence acceleration algorithm is introduced which significantly reduces the turnaround time to reach time-periodic solutions. The application of this convergence acceleration algorithm will...

Network middelware illustrated for enterprise enhanced operation

Enterprises are confronted with the challenge to lower cost of product engineering. Engineers enter and leave enterprises. Much engineering know-how can be conserved for use by successive generations of engineers in documented engineering procedures, in software for simulation and in the supporting documents and simulation related data. IT can...

A family of les filters with nonuniform filter widths

In this TP a family of filters for Large Eddy Simulation with nonuniform filter widths is constructed that commute with differentiation up to any given order.

Op hùn plaats? Deelrapport 5: Allochtonen en moeilijk verhuurbare woningcomplexen in Rotterdam

De huisvesting van allochtonen geniet al geruime tijd de belangstelling van beleidsmedewerkers, belangengroepen en politici. Achterstand en achterstelling dient bestreden te worden, zo luidt het devies. Deze studie naar de huisvestingssituatie van Turken, Marokkanen, Surinamers en Antillianen gedurende de jaren tachig, werpt een nieuw ligt op...

Op hùn plaats? Deelrapport 6: Allochtonen en moeilijk verhuurbare woningcomplexen in Spijkenisse

De huisvesting van allochtonen geniet al geruime tijd de belangstelling van beleidsmedewerkers, belangengroepen en politici. Achterstand en achterstelling dient bestreden te worden, zo luidt het devies. Deze studie naar de huisvestingssituatie an Turken, Marokkanen, Surinamers en Antillianen gedurende de jaren tachtig, werpt een nieuw ligt op...

Opkomst en ondergang van de Tjalk: Analyse van het verval van een woningscomplex in Lelystad

Beperkt uitzicht op de overkant, Een sociaal veiliger woonomgeving KAVEL 6

Uitzicht op de overkant, een sociaal veiliger woonomgeving

In februari 1986 heeft het Stedelijk Overleg Stadsvernieuwing (SOS), via B & W van de gemeente Den Haag, een subsidie-aanvraag ingediend bij de Stuurgroep Bestuurlijke Preventie van Criminaliteit voor de uitvoering van twee projecten. Het betrof de verbeteringsmaatregelen in het wooncomplex Kavel 6 en een voorlichtingsproject over sociale...