Fundamental differences between SPH and grid methods
(2007) In Monthly Notices of the Royal Astronomical Society 380(3). p.963-978- Abstract
We have carried out a comparison study of hydrodynamical codes by investigating their performance in modelling interacting multiphase fluids. The two commonly used techniques of grid and smoothed particle hydrodynamics (SPH) show striking differences in their ability to model processes that are fundamentally important across many areas of astrophysics. Whilst Eulerian grid based methods are able to resolve and treat important dynamical instabilities, such as Kelvin-Helmholtz or Rayleigh-Taylor, these processes are poorly or not at all resolved by existing SPH techniques. We show that the reason for this is that SPH, at least in its standard implementation, introduces spurious pressure forces on particles in regions where there are steep... (More)
We have carried out a comparison study of hydrodynamical codes by investigating their performance in modelling interacting multiphase fluids. The two commonly used techniques of grid and smoothed particle hydrodynamics (SPH) show striking differences in their ability to model processes that are fundamentally important across many areas of astrophysics. Whilst Eulerian grid based methods are able to resolve and treat important dynamical instabilities, such as Kelvin-Helmholtz or Rayleigh-Taylor, these processes are poorly or not at all resolved by existing SPH techniques. We show that the reason for this is that SPH, at least in its standard implementation, introduces spurious pressure forces on particles in regions where there are steep density gradients. This results in a boundary gap of the size of an SPH smoothing kernel radius over which interactions are severely damped.
(Less)
- author
- publishing date
- 2007-09-01
- type
- Contribution to journal
- publication status
- published
- keywords
- Galaxies: evolution, Galaxies: formation, Galaxies: general, Hydrodynamics, Instabilities, ISM: clouds, Methods: numerical, Turbulence
- in
- Monthly Notices of the Royal Astronomical Society
- volume
- 380
- issue
- 3
- pages
- 16 pages
- publisher
- Oxford University Press
- external identifiers
-
- scopus:34548640111
- ISSN
- 0035-8711
- DOI
- 10.1111/j.1365-2966.2007.12183.x
- language
- English
- LU publication?
- no
- id
- fc204cf1-2e89-4b85-91c2-1fc1646d5f81
- date added to LUP
- 2019-02-07 11:25:30
- date last changed
- 2022-04-25 21:26:26
@article{fc204cf1-2e89-4b85-91c2-1fc1646d5f81, abstract = {{<p>We have carried out a comparison study of hydrodynamical codes by investigating their performance in modelling interacting multiphase fluids. The two commonly used techniques of grid and smoothed particle hydrodynamics (SPH) show striking differences in their ability to model processes that are fundamentally important across many areas of astrophysics. Whilst Eulerian grid based methods are able to resolve and treat important dynamical instabilities, such as Kelvin-Helmholtz or Rayleigh-Taylor, these processes are poorly or not at all resolved by existing SPH techniques. We show that the reason for this is that SPH, at least in its standard implementation, introduces spurious pressure forces on particles in regions where there are steep density gradients. This results in a boundary gap of the size of an SPH smoothing kernel radius over which interactions are severely damped.</p>}}, author = {{Agertz, Oscar and Moore, Ben and Stadel, Joachim and Potter, Doug and Miniati, Francesco and Read, Justin and Mayer, Lucio and Gawryszczak, Artur and Kravtsov, Andrey and Nordlund, Åke and Pearce, Frazer and Quilis, Vicent and Rudd, Douglas and Springel, Volker and Stone, James and Tasker, Elizabeth and Teyssier, Romain and Wadsley, James and Walder, Rolf}}, issn = {{0035-8711}}, keywords = {{Galaxies: evolution; Galaxies: formation; Galaxies: general; Hydrodynamics; Instabilities; ISM: clouds; Methods: numerical; Turbulence}}, language = {{eng}}, month = {{09}}, number = {{3}}, pages = {{963--978}}, publisher = {{Oxford University Press}}, series = {{Monthly Notices of the Royal Astronomical Society}}, title = {{Fundamental differences between SPH and grid methods}}, url = {{http://dx.doi.org/10.1111/j.1365-2966.2007.12183.x}}, doi = {{10.1111/j.1365-2966.2007.12183.x}}, volume = {{380}}, year = {{2007}}, }