@article{Milthaler:2012,
author = {Milthaler, FFM and Gorman, GJ and Piggott, MD},
journal = {ECCOMAS 2012 - European Congress on Computational Methods in Applied Sciences and Engineering, e-Book Full Papers},
pages = {5621--5640},
title = {Reducing spurious drag forces when using mesh adaptivity in CFD},
year = {2012}
}

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TY  - JOUR
AB  - This work explores the impact of mesh adaptivity methods in combination with fixed as well as adaptive timestepping when modelling fluid dynamical systems that are sensitive to minor changes in the fluid's pressure and velocity. Here the diagnostic of interest for fluidsolid interaction modelling is the drag force. Depending on the solid's properties, even minor unphysical abrupt changes, so-called peaks, in the drag force - due to mesh adaptivity - could lead to a major disturbance in the model. For such systems the need naturally arises to reduce these peaks to a certain degree, until the sudden changes are small enough to be neglected. Hence, in this paper a variety of approaches are described and compared against one another, that aim to reduce these peaks. Moreover, further studies show the relation between the peaks in the drag force to the timestep, and pressure. The 3D-CFD software Fluidity, which uses an arbitrarily unstructured mesh, and a 3D mesh optimization algorithm was used for this case-study.
AU  - Milthaler,FFM
AU  - Gorman,GJ
AU  - Piggott,MD
EP  - 5640
PY  - 2012///
SP  - 5621
TI  - Reducing spurious drag forces when using mesh adaptivity in CFD
T2  - ECCOMAS 2012 - European Congress on Computational Methods in Applied Sciences and Engineering, e-Book Full Papers
ER  - 

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