dc.contributor.author Booth, Richard dc.contributor.author Sijacki, Debora dc.contributor.author Clarke, Catherine dc.date.accessioned 2018-10-10T10:44:30Z dc.date.available 2018-10-10T10:44:30Z dc.date.issued 2015-10-01 dc.identifier.issn 0035-8711 dc.identifier.uri https://www.repository.cam.ac.uk/handle/1810/283513 dc.description.abstract We present a 'two-fluid' implementation of dust in smoothed particle hydrodynamics (SPH) in the test particle limit. The scheme is able to handle both short and long stopping times and reproduces the short friction time limit, which is not properly handled in other implementations. We apply novel tests to verify its accuracy and limitations, including multi-dimensional tests that have not been previously applied to the drag-coupled dust problem and which are particularly relevant to self-gravitating protoplanetary discs. Our tests demonstrate several key requirements for accurate simulations of gas-dust mixtures. Firstly, in standard SPH particle jitter can degrade the dust solution, even when the gas density is well reproduced. The use of integral gradients, a Wendland kernel and a large number of neighbours can control this, albeit at a greater computational cost. Secondly, when it is necessary to limit the artificial viscosity we recommend using the Cullen & Dehnen (2010) switch, since the alternative, using ${\alpha} \sim 0.1$, can generate a large velocity noise up to ${{\sigma}_v} \lesssim 0.3 c_s$ in the dust particles. Thirdly, we find that an accurate dust density estimate requires $>400$ neighbours, since, unlike the gas, the dust particles do not feel regularization forces. This density noise applies to all particle-based two-fluid implementations of dust, irrespective of the hydro solver and could lead to numerically induced fragmentation. Although our tests show accurate dusty gas simulations are possible, care must be taken to minimize the contribution from numerical noise. dc.publisher Oxford University Press (OUP) dc.title Smoothed particle hydrodynamics simulations of gas and dust mixtures dc.type Article prism.endingPage 3947 prism.issueIdentifier 4 prism.publicationDate 2015 prism.publicationName Monthly Notices of the Royal Astronomical Society prism.startingPage 3932 prism.volume 452 dc.identifier.doi 10.17863/CAM.30876 rioxxterms.versionofrecord 10.1093/mnras/stv1486 rioxxterms.licenseref.uri http://www.rioxx.net/licenses/all-rights-reserved rioxxterms.licenseref.startdate 2015-01-01 dc.contributor.orcid Booth, Richard [0000-0002-0364-937X] dc.contributor.orcid Sijacki, Debora [0000-0002-3459-0438] dc.contributor.orcid Clarke, Catherine [0000-0003-4288-0248] dc.identifier.eissn 1365-2966 dc.publisher.url http://dx.doi.org/10.1093/mnras/stv1486 rioxxterms.type Journal Article/Review pubs.funder-project-id Science and Technology Facilities Council (ST/K000985/1) pubs.funder-project-id Science and Technology Facilities Council (ST/L000725/1) pubs.funder-project-id Science and Technology Facilities Council (ST/M007073/1) pubs.funder-project-id STFC (ST/M007073/1) cam.issuedOnline 2015-08-10 rioxxterms.freetoread.startdate 2016-01-01
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