Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/2999
Authors: De' Michieli Vitturi, M.* 
Esposti Ongaro, T.* 
Neri, A.* 
Salvetti, M. V.* 
Beux, F.* 
Title: An immersed boundary method for compressible multiphase flows: application to the dynamics of pyroclastic density currents
Journal: Computational Geosciences 
Series/Report no.: 3 /11 (2007)
Publisher: Springer
Issue Date: Sep-2007
DOI: 10.1007/s10596-007-9047-9
Keywords: Pyroclastic density currents
Compressible flows
Cartesian grids
Finite-volume method
Immersed boundary method
Numerical simulation
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk 
Abstract: An immersed boundary technique suitable for the solution of multiphase compressible equations of gas–particle flows of volcanic origin over complex 2D and 3D topographies has been developed and applied. This procedure combines and extends different existing methods designed for incompressible flows. Furthermore, the extension to compressible multiphase flows is achieved through a flux correction term in the mass continuity equations of the immersed cells that accounts for density variations in the partial volumes. The technique is computationally accurate and inexpensive, if compared to the use and implementation of the finite-volume technique on unstructured meshes. The first applications that we consider are the simulations of pyroclastic density currents generated by the collapse of a volcanic column in 2D axisymmetric geometry and by a dome explosion in 3D. Results show that the immersed boundary technique can significantly improve the description of the no-slip flow condition on an irregular topography even with relatively coarse meshes. Although the net effect of the present technique on the results is difficult to quantify in general terms, its adoption is recommended any time that cartesian grids are used to describe the large-scale dynamics of pyroclastic density currents over volcano topographies.
Appears in Collections:Article published / in press

Files in This Item:
File Description SizeFormat Existing users please Login
CG_deMichieli_et_al.pdf953.75 kBAdobe PDF
Show full item record

WEB OF SCIENCETM
Citations 50

8
checked on Feb 10, 2021

Page view(s)

128
checked on Mar 16, 2024

Download(s)

19
checked on Mar 16, 2024

Google ScholarTM

Check

Altmetric