Events

Here you can find upcoming and past events organized by our group.

  • Thu
    15
    Nov
    2018

    11:30SC Seminar Room 32-349

    Dr. Hua-Dong Yao, Division of Fluid Dynamics, Department of Mechanics and Maritime Sciences, Chalmers University of Technology

    Title:
    Hybrid CAA Methods for Predicting Flow-Induced Exterior and Interior Noise

    Abstract:

    As one of the contaminating productions of flows, noise is emphasized to reduce for many civil and military applications. For commercial aircraft and ground vehicles (cars, trucks, high-speed trains, etc.), the noise pollutes urban and cabin environments. The noise signature of submarines is a crucial concern for cloaking them. Prediction of the noise using numerical methods is a challenging task. Since the noise has much lower energy than the noise sources in the flows, an approximation or modeling in the numerical methods developed for flow simulations can introduce significant spurious noise, which could even mask the real noise. Furthermore, mistreatments in the numerical schemes and modeling for acoustics simulations also account for the spurious noise generation. To tackle these numerical challenges, computational aeroacoustics (CAA) has been developed since the breakthrough by Lighthill in 1952. Lighthill proposed the acoustic analogy that isolates the flow and noise simulation based on the different physical characteristics between acoustic waves and hydrodynamic variables. The idea of the isolation is the principle foundation of hybrid CAA methods nowadays, which couple computational fluid dynamics (CFD) methods with linearized equations that describe acoustic wave generation and propagation with/without hydrodynamic convection. We will review the hybrid CAA methods that are commonly used for the noise prediction. The CFD methods include DNS, LES, DES, and RANS coupled with the stochastic modeling of hydrodynamic velocity fluctuations. The acoustic equations are formulated by means of the acoustic analogy methods (the Lighthill formulation and the FW-H formulations, etc.), the boundary element method, the finite element method, and a simplified form of the acoustic perturbation equations. The hybrid methods will be introduced in conjunction with the practices for high-lift facilities, landing gears, flap-side edges, plenum fans, sail masts, vehicle side-view mirrors, and isotropic turbulence.

  • Thu
    22
    Nov
    2018

    11:30SC Seminar Room 32-349

    Simon Extra, Brandenburg University of Technology Cottbus-Senftenberg

    Title:
    Preliminary Core Engine Design by Cascaded Optimization Processes

    Abstract:

    Design of aero engines is a rather complex process using sophisticated software tools for obtaining optimal performance. Several projects involving the application of optimization tools to aero engine design have been undertaken to improve the design workflow. Most of these projects, however, focused on the optimal design of a specific component of the core engine only, where processes for compressor, combustor and turbine were based on proven preliminary design tools and yielded convincing results and improvements. This reflects the current engine design approach where optimization of components is performed separately by teams of specialists. Interfaces between the components are defined by an initial performance calculation and fixed throughout component optimization. This restricts the design space substantially and provides no information about the quality of the interface definitions used.
    To overcome these limitations, the design space has to be extended and a coupled method for preliminary core engine design has to be used: Such an approach will be proposed and discussed in the presentation. It is based on collaborative optimization (CO) which allows a separate optimization of all component, whilst still observing overall optimization goals for the core engine. The strategy influences the interfaces between the components and coordinates the subtasks through a global optimizer to enforce a consistent, optimal solution. The subtasks use the component optimization processes already developed and tested, which had to be modified for implementing and coupling them in an overall automated optimization process.

  • Thu
    13
    Dec
    2018

    9:00Room 32-349

    The goal of the workshop is to give an overview of recent research activities at SciComp. In addition, collaborators from ITWM and BOSCH will give invited presentations for scientific exchange.

    Program

    9:00-9:45 Avraam Chatzimichailidis (ITWM)

    9:45-10:30 Dr. Stefanie Günther

    10:30-11:00 Coffee break

    11:00-11:45 Raju Ram (ITWM)

    11:45-12:30 Javad Fadaie Ghotbi (ITWM)

    12:30-14:00 Lunch

    14:00-17:00 Scientific Short Presentations (10+5 minutes each)
    (Dr. E. Özkaya, T. Dick, Dr. M. Sagebaum, Dr. R. Sanchez Fernandez, T. Albring, Dr. B. Zhou, L. Kusch, Dr. J. Schüle, O. Burghardt, T. Kattmann (BOSCH))

    17:00 – 17:30 AG SciComp: Review 2018 and Outlook 2019
    (Prof. N. Gauger, U. Hahn)

    18:30 Workshop Dinner

  • Thu
    24
    Jan
    2019

    11:30SC Seminar Room 32-349

    Dr. Rauno Cavallaro, Aerospace Engineering Group, Department of Bioengineering and Aerospace Engineering, Carlos III University Madrid

    Title:
    TBA

    Abstract:

    TBA