STRING - Comet-like Animation Based on Trajectories of Transient Water Flow

To obtain an impression of results of computational fluid dynamics, simulated velocity fields have to be visualized adequately. In cooperation with delta h Ingenieurgesellschaft mbH the software STRING is developed. It enables an intuitive visualization of steady-state and transient three-dimensional velocity fields on plane and curved surfaces with the help of Pathlets. The three-dimensional data can be displayed in horizontal as well as vertical cutting planes.

Pathlets are comet-like shapes whose length correlates with the local velocity and whose position is given by a short part of a trajectory. Due to an equidistribution of the Pathlets in the domain and the movement of the streamlets with the fluid flow a natural visualization is achieved.

Visualisierung ELDER-Problem
© delta h
Visualization of Elder's Problem; Deposits with Potentials (up) and Concetraitions (down).
© delta h
Comet-like Animation Based on Trajectories of Transient Water Flow
© delta h
Influence of the Source of a High Tide

The software STRING is based on ideas generated during the research on the Finite Poinset Method (FPM) which has been developed in the department as an individual, independent basic software for simulation tasks in a wide area of flow and continuum mechanical problems. Especially the management of the local distribution of the Pathlets in order to prevent holes and clusters has to be mentioned because it yields an appealing visualization.

Further Features:

  • interface to SPRING as a software for water system modeling which is developed by delta h Ingenieurgesellschaft mbH
  • platform independent software for any operation system
  • fast data access
  • graphical user interface for easy control of the visualization
  • additional visualization of scalar, time-(in)dependent attributes in the background (e.g., potential, concentration)
  • visualization in bounded areas of the surfaces
  • overlay of geographical textures
  • computation and saving of single images also including transparency enabling postprocessing, e.g., the addition of further information in a video clip


delta h Ingenieurgesellschaft