xROM is a freely available tool for reduced-order modeling. One purpose of xROM is to derive dynamic POD models from snapshot data and Galerkin projection using the Navier-Stokes equations.

Moreover, xROM

  • can analyze native CFD and PIV data;
  • can handle a large spectrum of 2D and 3D grids (Cartesian, structured, unstructured, etc.);
  • can create other modal expansions (DMD) and other modes (e.g. shift modes);
  • is user-friendly through a single configuration file;
  • is parallelizable.

We have used earlier versions of this tool for most of the empirical Galerkin models since 2003 and plan to continually expand xROM's capabilities (e.g.SPOD, CROM, etc.).

User Manual:


Noack, B. R., Fernex, D. & Semaan, R. (2017) "xROM - a Toolkit for Reduced Order Modelling of Fluid Flows (Version 1.0)," Reference Manual, LIMSI-CNRS and TU Braunschweig.

PDF-Dokument [1.4 MB]

Main developers:

  • Daniel Fernex
  • Richard Semaan, and
  • Bernd Noack



Signal COrrection and Uncertainty quantification Toolbox, SCOUT, analyzes and corrects one-dimensional signals. Specifically, it allows to:

  1. Check and correct for stationarity
  2. Detect and correct spurious samples.
  3. Check for normality.
  4. Check for periodicity.
  5. Remove a periodic component or a frequency band.
  6. Perform spectral analysis and determine the integral time scale.
  7. Perform uncertainty analysis on individual signals and propagated signals through a data reduction equation. The uncertainty analysis also yields uncertainties on the higher central moments (up to the fourth moment). 

It enables students and professionals alike to analyze, characterize, and correct for (mainly) experimentally-acquired signals. The program is oriented towards time traces, but an easy adaptation to spatial distributions can be performed by the user. SCOUT is available in two variants:

  1. Graphical User Interface (GUI) version, and
  2. Script-based version



Main developers:

  • Richard Semaan
  • Vikas Yadav



SCOUT is not openly available (yet). Please contact me if you are interested.


Dr. Richard Semaan

Technische Universität Braunschweig

Institute of Fluid Mechanics

Office 117
Hermann-Blenk-Str. 37
38108 Braunschweig

Telefon: +49 531391 94258+49 531391 94258
Fax: +49 531391 94254

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