Applying ILMD technique with time scaling for CFD simulation of diesel engine

Detailed mechanisms describing ignition, flame propagation and pollutant formation typically involve several hundred species and elementary reactions, prohibiting their use in practical three-dimensional engine simulations. Conventionally reduced mechanisms often fail to predict minor radicals and pollutant precursors. The ILDM-method is an...

Numerical Simulation of Bubble and Droplet Dynamics using Partitioned Solvers

Bubbles and droplets can be simulated as a problem involving Fluid-Structure Interaction (FSI). The interface between the liquid and the gas is then conceived as a zero thickness structure. The position of the interface is determined by the equilibrium between surface tension effects and the pressure jump across the interface. Most techniques...

A Reduced-Basis Method for solving parameter-dependent convection-diffusion problems around rigid bodies

We consider a convection-diffusion problem in a box in which rigid bodies are present. The location and orientation of these bodies are subject to a set of parameters. In order to use a reduced basis method, we perform a two-step method. In the first step, we transform the parameter-dependent geometric situation to a reference situation (also...

Reduced models of higher order systems based on Kautz expansions

In this contribution, the advantages of reduced order modeling (ROM) techniques based on oblique projectors are highlighted. Specific attention is focussed on obtaining models which have small residual errors over a predetermined bandwidth. As expansion functions, a bandlimited two-parameter Kautz basis is proposed. The proposed technique...

A CSP-Based Skeletal Mechanism Generation Procedure: Auto-Ignition and Premixed Laminar flames in n-Heptane/Air Mixtures

We use a procedure based on the decomposition into fast and slow dynamical components offered by the Computational Singular Perturbation (CSP) method to generate automatically skeletal kinetic mechanisms for the simplification of the kinetics of n-heptane oxidation. The detailed mechanism of the n-heptane oxidation here considered has been...

A Reduced Basis Element Method for Complex Flow Systems

The reduced basis element method is a new approach for approximating the solution of problems described by partial differential equations within domains belonging to a certain class. The method takes its roots in domain decomposition methods and reduced basis discretizations. The basic idea is to first decompose the computational domain into...

Real-time reduced basis techniques for Navier-Stokes equations: Optimization of parametrized bypass configurations

The reduced basis method on parametrized domains is applied to approximate blood flow through an arterial bypass. The aim is to provide (a) a sensitivity analysis for relevant geometrical quantities of interest in bypass configurations and (b) rapid and reliable prediction of integral functional outputs ( such as fluid mechanics indexes). The...

Strong coupling of partitioned fluid-structure interaction problems with reduced order models

The paper describes a new and powerful technique to solve strongly coupled fluid-structure interaction (FSI) problems with partitioned solvers. In order to achieve strong coupling approximate Jacobians of the fluid and structural solvers have to be known. In the proposed method the response to applied displacement and pressure modes are used to...