{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1390858309585675520.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.2208/jscejj.22-15023"}},{"identifier":{"@type":"URI","@value":"https://www.jstage.jst.go.jp/article/jscejj/79/15/79_22-15023/_pdf"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@language":"en","@value":"REVISITING OF THE PRESSURE GRADIENT MODEL OF THE SPH METHOD FOR INCOMPRESSIBLE FLUIDS INCLUDING NEGATIVE PRESSURE"},{"@language":"ja","@value":"負圧を含む非圧縮性流体を対象とした SPH 法の圧力勾配モデルの原点回帰"}],"dc:language":"ja","description":[{"type":"abstract","notation":[{"@language":"en","@value":"<p>In recent years, a number of bridges have been washed out due to torrential rains. When analyzing scour around piers, one of the causes of damage to bridges, using particle methods such as the SPH(Smoothed Particle Hydrodynamics) methods, the non-uniform distribution of particles and tensile instability caused by negative pressure occur. We especially focus on the pressure gradient model, which has been conventionally and frequently used for stable analysis, and discuss pressure gradient calculations suitable for negative pressure regions. Moreover we introduce a modified gradient model that satisfies first-order consistency as well as PS (Particle Shifting) scheme to maintain the particle distribution regularity. The modified SPH method reproduces von Karman vortex, and its validity is quantitatively examined by comparing the twin vortex size, drag coefficient, lift coefficient and Strouhal number with experimental data.</p>"},{"@language":"ja","@value":"<p>近年，局地的な豪雨により，土砂災害や橋脚の流失が多発している．橋梁被害要因のひとつである橋脚周りの洗掘を粒子法である SPH 法で解析する際，粒子分布の偏在化や負圧に伴う引張不安定性が生じる．本研究では，負圧領域においても安定した解析を行うために，慣例的に頻用されてきた圧力勾配モデルに焦点を当て，負圧領域に適した圧力勾配計算について議論した．また，粒子を用いた離散近似および粒子配置の乱れに対して一次の精度を満足する修正勾配モデルと粒子シフティング技術を用いた．上記の SPH 法の基礎技術を用い， ISPH 法による定式化で，円柱周りの流れで生じる双子渦・カルマン渦の再現解析を実施し，実験結果との比較検討を行い，提案モデルの有用性を示した．</p>"}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1410858309585675522","@type":"Researcher","foaf:name":[{"@language":"en","@value":"SAEKI Yusuke"},{"@language":"ja","@value":"佐伯 勇輔"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"九州大学大学院　工学府土木工学専攻"}]},{"@id":"https://cir.nii.ac.jp/crid/1030018198857116928","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000415088763"}],"foaf:name":[{"@language":"en","@value":"TSUJI Kumpei"},{"@language":"ja","@value":"辻 勲平"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"九州大学大学院　工学府建設システム工学専攻"}]},{"@id":"https://cir.nii.ac.jp/crid/1420001326215030912","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"90411230"},{"@type":"NRID","@value":"1000090411230"},{"@type":"CINII_AUTHOR_ID","@value":"DA16389029"},{"@type":"URI","@value":"https://ci.nii.ac.jp/author/DA16389029#entity"},{"@type":"URI","@value":"https://viaf.org/viaf/NII%7CDA16389029"},{"@type":"NRID","@value":"9000303988104"},{"@type":"NRID","@value":"9000402618896"},{"@type":"NRID","@value":"9000408583535"},{"@type":"NRID","@value":"9000408771554"},{"@type":"NRID","@value":"9000241452053"},{"@type":"NRID","@value":"9000241460500"},{"@type":"NRID","@value":"9000241578987"},{"@type":"NRID","@value":"9000241567586"},{"@type":"NRID","@value":"9000329415455"},{"@type":"NRID","@value":"9000386211921"},{"@type":"NRID","@value":"9000413902295"},{"@type":"NRID","@value":"9000396131422"},{"@type":"NRID","@value":"9000255808877"},{"@type":"NRID","@value":"9000241195607"},{"@type":"NRID","@value":"9000241454130"},{"@type":"NRID","@value":"9000326252516"},{"@type":"NRID","@value":"9000356893525"},{"@type":"NRID","@value":"9000304311305"},{"@type":"NRID","@value":"9000398819428"},{"@type":"NRID","@value":"9000392252445"},{"@type":"NRID","@value":"9000255808738"},{"@type":"NRID","@value":"9000256363012"},{"@type":"NRID","@value":"9000241569468"},{"@type":"NRID","@value":"9000409515214"},{"@type":"NRID","@value":"9000283785720"},{"@type":"NRID","@value":"9000283784990"},{"@type":"NRID","@value":"9000415088764"},{"@type":"NRID","@value":"9000257780019"},{"@type":"NRID","@value":"9000241439895"},{"@type":"NRID","@value":"9000241441376"},{"@type":"NRID","@value":"9000313609862"},{"@type":"NRID","@value":"9000386211401"},{"@type":"NRID","@value":"9000415088907"},{"@type":"NRID","@value":"9000413902544"},{"@type":"NRID","@value":"9000413902341"},{"@type":"NRID","@value":"9000283600226"},{"@type":"NRID","@value":"9000283357913"},{"@type":"NRID","@value":"9000257797111"},{"@type":"NRID","@value":"9000403026790"},{"@type":"NRID","@value":"9000356893535"},{"@type":"NRID","@value":"9000329415486"},{"@type":"NRID","@value":"9000251869516"},{"@type":"NRID","@value":"9000304310852"},{"@type":"NRID","@value":"9000303987413"},{"@type":"NRID","@value":"9000283784729"},{"@type":"NRID","@value":"9000408583462"},{"@type":"NRID","@value":"9000256362388"},{"@type":"NRID","@value":"9000241448593"},{"@type":"NRID","@value":"9000241202703"},{"@type":"NRID","@value":"9000412374450"},{"@type":"NRID","@value":"9000409518240"},{"@type":"NRID","@value":"9000394964807"},{"@type":"NRID","@value":"9000394960274"},{"@type":"NRID","@value":"9000241623738"},{"@type":"NRID","@value":"9000254807621"},{"@type":"NRID","@value":"9000255808575"},{"@type":"NRID","@value":"9000241442270"},{"@type":"NRID","@value":"9000021346302"},{"@type":"NRID","@value":"9000402618555"},{"@type":"NRID","@value":"9000412377633"},{"@type":"NRID","@value":"9000412373974"},{"@type":"NRID","@value":"9000296677810"},{"@type":"NRID","@value":"9000251862527"},{"@type":"NRID","@value":"9000326252489"},{"@type":"NRID","@value":"9000415158516"},{"@type":"NRID","@value":"9000329415522"},{"@type":"NRID","@value":"9000382214807"},{"@type":"NRID","@value":"9000241205731"},{"@type":"NRID","@value":"9000403026744"},{"@type":"NRID","@value":"9000403026351"},{"@type":"NRID","@value":"9000021701545"},{"@type":"NRID","@value":"9000283784972"},{"@type":"NRID","@value":"9000020821676"},{"@type":"NRID","@value":"9000415088801"},{"@type":"NRID","@value":"9000392252455"},{"@type":"NRID","@value":"9000018680056"},{"@type":"NRID","@value":"9000409515366"},{"@type":"NRID","@value":"9000296676212"},{"@type":"NRID","@value":"9000251866226"},{"@type":"NRID","@value":"9000394964821"},{"@type":"NRID","@value":"9000394957232"},{"@type":"NRID","@value":"9000412651120"},{"@type":"NRID","@value":"9000283617902"},{"@type":"NRID","@value":"9000241201683"},{"@type":"NRID","@value":"9000243773213"},{"@type":"NRID","@value":"9000413902075"},{"@type":"NRID","@value":"9000402618234"},{"@type":"NRID","@value":"9000392252448"},{"@type":"NRID","@value":"9000258264291"},{"@type":"NRID","@value":"9000241190741"},{"@type":"NRID","@value":"9000241457603"},{"@type":"NRID","@value":"9000409518264"},{"@type":"NRID","@value":"9000251866201"},{"@type":"NRID","@value":"9000326252532"},{"@type":"NRID","@value":"9000356894673"},{"@type":"NRID","@value":"9000356895419"},{"@type":"NRID","@value":"9000411391867"},{"@type":"NRID","@value":"9000411391862"},{"@type":"NRID","@value":"9000392246491"},{"@type":"NRID","@value":"9000258444492"},{"@type":"NRID","@value":"9000403026866"},{"@type":"NRID","@value":"9000329415410"},{"@type":"NRID","@value":"9000414228008"},{"@type":"NRID","@value":"9000399512558"},{"@type":"NRID","@value":"9000296676487"},{"@type":"NRID","@value":"9000326254699"},{"@type":"NRID","@value":"9000403026374"},{"@type":"NRID","@value":"9000402618164"},{"@type":"NRID","@value":"9000255809253"},{"@type":"NRID","@value":"9000387478001"},{"@type":"NRID","@value":"9000241578754"},{"@type":"NRID","@value":"9000251862801"},{"@type":"NRID","@value":"9000403026779"},{"@type":"NRID","@value":"9000394961496"},{"@type":"NRID","@value":"9000386211890"},{"@type":"NRID","@value":"9000408584004"},{"@type":"NRID","@value":"9000408583677"},{"@type":"NRID","@value":"9000283617588"},{"@type":"NRID","@value":"9000409518292"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/read0142554"}],"foaf:name":[{"@language":"en","@value":"ASAI Mitsuteru"},{"@language":"ja","@value":"浅井 光輝"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"九州大学大学院　工学研究院　社会基盤部門"}]}],"publication":{"publicationIdentifier":[{"@type":"EISSN","@value":"24366021"}],"prism:publicationName":[{"@language":"en","@value":"Japanese Journal of JSCE"},{"@language":"ja","@value":"土木学会論文集"},{"@language":"en","@value":"Japanese Journal of JSCE"},{"@language":"ja","@value":"土木学会論文集"}],"dc:publisher":[{"@language":"en","@value":"Japan Society of Civil Engineers"},{"@language":"ja","@value":"公益社団法人 土木学会"}],"prism:publicationDate":"2023","prism:volume":"79","prism:number":"15","prism:startingPage":"n/a"},"reviewed":"false","url":[{"@id":"https://www.jstage.jst.go.jp/article/jscejj/79/15/79_22-15023/_pdf"}],"availableAt":"2023","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=SPH","dc:title":"SPH"},{"@id":"https://cir.nii.ac.jp/all?q=Tensile%20instability","dc:title":"Tensile instability"},{"@id":"https://cir.nii.ac.jp/all?q=pressure%20gradient%20model","dc:title":"pressure gradient model"},{"@id":"https://cir.nii.ac.jp/all?q=von%20Karman%20vortex","dc:title":"von Karman vortex"},{"@id":"https://cir.nii.ac.jp/all?q=SPH","dc:title":"SPH"},{"@id":"https://cir.nii.ac.jp/all?q=Tensile%20instability","dc:title":"Tensile instability"},{"@id":"https://cir.nii.ac.jp/all?q=pressure%20gradient%20model","dc:title":"pressure gradient model"},{"@id":"https://cir.nii.ac.jp/all?q=von%20Karman%20vortex","dc:title":"von Karman vortex"}],"project":[{"@id":"https://cir.nii.ac.jp/crid/1040000782013648512","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"19H01098"},{"@type":"JGN","@value":"JP19H01098"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19H01098/"}],"notation":[{"@language":"ja","@value":"発見的数値解析利用を実現する並列分離型連成フレームワークの創成"},{"@language":"en","@value":"Parallel and Partitioned Coupling Framework for Heuristic Numerical Analysis"}]},{"@id":"https://cir.nii.ac.jp/crid/1040003825718860544","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"20H02418"},{"@type":"JGN","@value":"JP20H02418"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20H02418/"}],"notation":[{"@language":"ja","@value":"サロゲートモデルで加速するインターディシプリナリ津波解析による確率論的被害予測"},{"@language":"en","@value":"An interdisciplinary stochastic tsunami disaster prediction accelerated by a surrogate model"}]},{"@id":"https://cir.nii.ac.jp/crid/1040288215556192896","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"21J12338"},{"@type":"JGN","@value":"JP21J12338"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21J12338/"}],"notation":[{"@language":"ja","@value":"粒子法に基づくマルチスケール・相転移型地盤崩壊シミュレータの構築"},{"@language":"en","@value":"Multi-scale Ground Failure Simulator Based on the Particle Method  in Consideration of Phase Transition"}]},{"@id":"https://cir.nii.ac.jp/crid/1040862776834049152","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"23K26356"},{"@type":"JGN","@value":"JP23K26356"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23K26356/"}],"notation":[{"@language":"ja","@value":"物理の経験知を埋め込んだデータ科学による複合災害のリアルタイム未来知"},{"@language":"en","@value":"Real-time prognosis of complex disasters through data science with embedded empirical knowledge of physics"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360004232075119744","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"A projection-based particle method with optimized particle shifting for multiphase flows with large density ratios and discontinuous density fields"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011145098463744","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Accuracy and stability in incompressible SPH (ISPH) based on the projection method and a new approach"}]},{"@id":"https://cir.nii.ac.jp/crid/1360292620330267136","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Incompressible smoothed particle hydrodynamics (SPH) with reduced temporal noise and generalised Fickian smoothing applied to body–water slam and efficient wave–body interaction"}]},{"@id":"https://cir.nii.ac.jp/crid/1360579818885956992","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Inflow/outflow with Dirichlet boundary conditions for pressure in ISPH"}]},{"@id":"https://cir.nii.ac.jp/crid/1360579820514226048","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"An improved particle shifting technique for incompressible smoothed particle hydrodynamics methods"}]},{"@id":"https://cir.nii.ac.jp/crid/1360855569678510848","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"A Cartesian Grid Method for Solving the Two-Dimensional Streamfunction-Vorticity Equations in Irregular Regions"}]},{"@id":"https://cir.nii.ac.jp/crid/1361137043864741504","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"An improved SPH method: Towards higher order convergence"}]},{"@id":"https://cir.nii.ac.jp/crid/1361137044844417792","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Open boundary conditions for ISPH and their application to micro-flow"}]},{"@id":"https://cir.nii.ac.jp/crid/1361699993516649472","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Incompressible smoothed particle hydrodynamics for free-surface flows: A generalised diffusion-based algorithm for stability and validations for impulsive flows and propagating waves"}]},{"@id":"https://cir.nii.ac.jp/crid/1361699995475752448","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Simulating 2D open-channel flows through an SPH model"}]},{"@id":"https://cir.nii.ac.jp/crid/1362262944668297728","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Variable resolution for SPH: A dynamic particle coalescing and splitting scheme"}]},{"@id":"https://cir.nii.ac.jp/crid/1362262945425411200","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Smoothed particle hydrodynamics: theory and application to non-spherical stars"}]},{"@id":"https://cir.nii.ac.jp/crid/1362825894860006656","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Upwind differencing scheme for the time-accurate incompressible Navier-Stokes equations"}]},{"@id":"https://cir.nii.ac.jp/crid/1363388843407662080","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Corrected First-Order Derivative ISPH in Water Wave Simulations"}]},{"@id":"https://cir.nii.ac.jp/crid/1363388845517729536","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"A numerical approach to the testing of the fission hypothesis"}]},{"@id":"https://cir.nii.ac.jp/crid/1363388846258227968","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Defining a universal and continuous Strouhal–Reynolds number relationship for the laminar vortex shedding of a circular cylinder"}]},{"@id":"https://cir.nii.ac.jp/crid/1363670319482932608","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Multi-resolution Delta-plus-SPH with tensile instability control: Towards high Reynolds number flows"}]},{"@id":"https://cir.nii.ac.jp/crid/1363951793516888576","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Experiments on the flow past a circular cylinder at low Reynolds numbers"}]},{"@id":"https://cir.nii.ac.jp/crid/1363951793627494400","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"An accurate SPH modeling of viscous flows around bodies at low and moderate Reynolds numbers"}]},{"@id":"https://cir.nii.ac.jp/crid/1363951794347954048","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Kármán Vortex Streets"}]},{"@id":"https://cir.nii.ac.jp/crid/1364233268641814144","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Space potential particles to enhance the stability of projection-based particle methods"}]},{"@id":"https://cir.nii.ac.jp/crid/1364233269566373760","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Preconditioned Multigrid Methods for Unsteady Incompressible Flows"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001204189747584","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Experimental Investigation of the Wakes behind Cylinders and Plates at Low Reynolds Numbers"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282680732668160","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Boundary Conditions for Simulating Karman Vortices Using the MPS Method"}]},{"@id":"https://cir.nii.ac.jp/crid/1390290929780233856","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"SEEPAGE FAILURE SIMULATION OF A CAISSON-TYPE BREAKWATER USING AN ISPH-DEM COUPLED METHOD"},{"@language":"ja","@value":"ISPH-DEM によるマウンド変形・ケーソン滑動を考慮した防波堤浸透崩壊シミュレーション"}]}],"dataSourceIdentifier":[{"@type":"JALC","@value":"oai:japanlinkcenter.org:2010251746"},{"@type":"CROSSREF","@value":"10.2208/jscejj.22-15023"},{"@type":"KAKEN","@value":"PRODUCT-24490113"},{"@type":"KAKEN","@value":"PRODUCT-24422641"},{"@type":"KAKEN","@value":"PRODUCT-24384050"},{"@type":"KAKEN","@value":"PRODUCT-25295978"}]}