Integrated Marine Informations System - IMIS

Persons | Institutes | Publications | Projects | Datasets | Maps
[ report an error in this record ]basket (1): add | show Print this page

one publication added to basket [361158]
How a flow aligned mesh improves TELEMAC model results
Smolders, S. (2022). How a flow aligned mesh improves TELEMAC model results, in: Bourban, S.E. et al. Proceedings of the XXVIIIth TELEMAC user conference, 18-19 October 2022, Paris-Saclay. pp. 45-49

Available in  Author 
Document type: Conference paper

Author keywords
    Flow aligned mesh, numerical diffusion, advection scheme, rotating cone

Author  Top 
  • Smolders, S., more

Abstract
    In an unstructured 2D mesh the quality can be checked by means of checking the aspect ratio of the individual triangles or even the edge growth ratio. This paper wants to show how the orientation of the triangles can also affect the model results. An estimation of the longitudinal and lateral numerical diffusion is given explaining why flow alignment can be beneficial in reducing the numerical diffusion. This is demonstrated for the advection of a tracer with the rotating cone example. The paper also shows an example of a 3D hydrodynamic model of the Scheldt estuary. A comparison is made between a good quality mesh and a flow aligned mesh for the same model domain. All variables are kept equal. The influence on tidal propagation is shown. The effect on the bottom friction coefficient is shown and the potential effect on a coupled sediment transport model is discussed. The flow aligned mesh reduces the amount of lateral numerical diffusion, it reduces the artificial loss of tidal energy along the estuary, and it improves the calibration result by getting more realistic bottom friction coefficients.

All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Author