{"id":209,"date":"2021-10-13T13:07:13","date_gmt":"2021-10-13T13:07:13","guid":{"rendered":"https:\/\/home.iitm.ac.in\/vsriram\/?page_id=209"},"modified":"2022-12-20T09:26:57","modified_gmt":"2022-12-20T09:26:57","slug":"iitm-rans3d","status":"publish","type":"page","link":"https:\/\/home.iitm.ac.in\/vsriram\/index.php\/research\/iitm-rans3d\/","title":{"rendered":"IITM-RANS3D"},"content":{"rendered":"

Welcome to the homepage of IITM-RANS3D. It is an in-house CFD code developed at the Department of Ocean Engineering, IIT Madras. The code has been developed with the aim of handling complex wave-structure interaction simulations in large domains over a long period of time.<\/p>\n

IITM-RANS3D is a multiphase code based on the single-fluid formulation of the incompressible Navier-Stokes equations. The Navier-Stokes equations are solved using a semi-explicit solver over a Cartesian staggered mesh. Multiphase treatment is achieved using the VOF method. Waves are generated through a Dirichlet input from the in-house fully non-linear potential theory (FNPT) code IITM-FNPT2D<\/a>. Turbulence effects are modeled using the RANS philosophy. Structures are modeled using the fictitious-domain method.<\/p>\n

Key Features and Strengths:<\/span><\/h4>\n
    \n
  1. Strong pressure-velocity coupling realized through the staggered mesh.<\/li>\n
  2. CICSAM scheme optimized for speed on Cartesian meshes through operator-splitting.<\/li>\n
  3. One-way coupled with IITM-FNPT2D <\/a>thus enabling very high fidelity generation of a wide range of waves.<\/li>\n
  4. One-way coupling with IITM-FNPT2D<\/a> allows for truncation of the RANS domain to the near-field of the structure. This saves computational effort by delegating the inviscid wave simulations to FNPT.<\/li>\n
  5. Wave simulations are energy preserving even for large domains (say GWK: 350m x 5m x 7m) and for long time (say >~100 s).<\/li>\n
  6. Turbulence effects characterizing wave-structure interaction modeled using the standard k-\u03b5 model.<\/li>\n
  7. Fictitious-domain modeling of the structure precludes modifying the mesh topology in the vicinity of the structure thus enabling the use of Cartesian meshes even for complex structures.<\/li>\n
  8. Parallelized using MPI. Capable of fully utilizing the computational resources offered by multi-core standalone compute nodes (SMA-shared memory architecture) as well as the VSR group server and IITM’s AQUA cluster (DMA-distributed memory architecture).<\/li>\n
  9. Option for importing structure geometries through *.STL files.<\/li>\n
  10. Capable of simulating forward speed problems.<\/li>\n<\/ol>\n

    Limitations (general):<\/span><\/h4>\n
      \n
    1. RANS as well as VOF formulation only applicable to Cartesian meshes.<\/li>\n
    2. Diffuse interface treatment of the solid region ; implicit imposition of the slip boundary condition.<\/li>\n
    3. Algebraic VOF scheme-based estimation of the interface location ; interface placement is not geometric.<\/li>\n<\/ol>\n

      Limitations (specific to release 1.0):<\/span><\/h4>\n
        \n
      1. No turbulence modeling ; laminar solver.<\/li>\n
      2. Time discretization is first order forward Euler ; pressure and diffusion terms treatment is second-order.<\/li>\n
      3. Two-phase Navier-Stokes formulation is non-conservative.<\/li>\n
      4. Capable of handling complex albeit fixed structures.<\/li>\n
      5. FNPT-RANS coupling is one-way.\u00a0\"IITM-RANS3D_updated\"<\/a><\/li>\n<\/ol>\n

        Work in progress and future updates:<\/span><\/h4>\n
          \n
        1. 6-DoF rigid solver, mooring lines & coupling for aero elasticity.<\/li>\n
        2. Compressible air phase modelling for OWC, entrapped air.<\/li>\n<\/ol>\n

          Typical Application problems:<\/span><\/span><\/h4>\n

          (1) Traditional Green-water loading on a obstacle model
          \n<\/a><\/strong>          \"Kleefsman<\/a><\/h4>\n

          (2) Steep solitary wave interacting with a cylinder<\/strong><\/h4>\n

          \"IITM-RANS3D_CYL_ANIM1\"<\/a><\/p>\n

          (3) Focused waves interacting with a moonpool<\/strong><\/h4>\n

          \"MOONPOOL\"<\/a><\/p>\n

          (4) Steepness-induced breaking of focusing waves<\/strong><\/h4>\n

          \"Focusing<\/a><\/p>\n

          (5) Solitary wave (H\/d-0.45) breaking over a plane-sloping beach<\/strong><\/h4>\n

          \"Li<\/a><\/p>\n

          (6) Steep solitary wave (H\/d=0.6) breaking over a sloping ridge<\/strong><\/h4>\n

          \"Ridge<\/a><\/p>\n

          (7) Focusing waves interacting with moving cylinder<\/strong><\/h4>\n

          \"Moving<\/a><\/p>\n

           <\/p>\n

          Publications:<\/strong><\/span><\/h4>\n

          (1)\u00a0N., Hari Ram, Saincher, S. and Sriram, V., 2022.<\/b> \u201cNumerical investigations into wave attenuation characteristics of vegetation belt in terms of vortex shedding due to different arrangement configuration<\/i>\u201d. IAHR-APD-2022 \u2013 Chennai.<\/a><\/p>\n

          (2)\u00a0Saincher, S. and Sriram, V., 2022.<\/b> \u201cApplication of IITM-RANS3D to wave-breaking and wave-structure-interaction problems<\/i>\u201d. IAHR-APD-2022 \u2013 Chennai.<\/a><\/p>\n

          (3)\u00a0Saincher, S. and Sriram, V., 2022.<\/b> \u201cComparative assessment of non-conservative and conservative RANS formulations for coastal applications involving breaking waves<\/i>\u201d. ICCE-2022 \u2013 Sydney.<\/p>\n

          (4)\u00a0Saincher, S. and Sriram, V., 2022.<\/b> \u201cA three dimensional hybrid fully nonlinear potential flow and <\/i>Navier Stokes <\/i>model for wave structure <\/i>interactions<\/i>\u201d. Ocean Engineering, 266, 112770.<\/a><\/p>\n

          (5)\u00a0Saincher, S. and Sriram, V., 2022.<\/b> \u201cAn efficient operator-split CICSAM scheme for three-dimensional multiphase-flow problems on Cartesian grids<\/i>\u201d. Computers & Fluids, 240, 105440.<\/a><\/p>\n

          (6) Harish, S., Saincher, S., Sriram, V., Sch\u00fcttrumpf, H. and Sannasiraj, S. A., 2022.<\/b> \u201cNumerical investigation of tsunami-like bore induced forces on overtopped buildings<\/i>\u201d. Oceans-2022 \u2013 Chennai.<\/a><\/p>\n

          (7)\u00a0Saincher, S., Wesly, J., Vineesh, P. and Sriram, V., 2021.<\/b> \u201cExperimental and <\/i>FNPT<\/i>-RANS investigations into gap-excitation and vortex dynamics in a rectangular moonpool interacting with focused waves<\/i>\u201d. OMAE-2021 \u2013 Virtual.<\/a><\/p>\n

          (8)\u00a0Saincher, S., Sriram, V. and Didenkulova, I., 2021.<\/b> \u201cRun-up of breaking focused waves on a beach studied experimentally in a large scale facility and numerically using hybrid <\/i>FNPT<\/i>-RANS model<\/i>\u201d. EGU (European Geosciences Union) General Assembly Conference Abstracts (vEGU21).<\/a><\/p>\n

          Download:<\/span><\/strong><\/h4>\n

          IITM – RANS3D is an open source code. We welcome researchers to either use it or change it according to your needs.<\/p>\n

          Any clarification and suggestions you may reach us: Dr. Shaswat Saincher: shaswat.saincher@gmail.com or Myself: vsriram@iitm.ac.in<\/p>\n

          Version 1.1:<\/strong> IITM-RANS3D_v1.1<\/a>\u00a0(Conservative Laminar Solver) – released Dec. 2022<\/p>\n

          Version 1.0:<\/strong> IITM-RANS3D_v1.0<\/a>\u00a0(Non Conservative Laminar Solver) – released Oct. 2021<\/p>\n

          Developed and tested by:<\/strong><\/span><\/span><\/p>\n

          Dr. Shaswat Saincher (PostDoc)<\/a><\/strong><\/p>\n

          Mr. Hari Ram N. (Ph.D) –\u00a0Wave-rigid vegetation interaction<\/p>\n

          Mr. Harish Selvam (Ph.D) –\u00a0Tsunami-induced overtopping over buildings<\/p>\n

          Ms. Shrushti Shirsat (M.Tech) – Aero-hydrodynamics of bottom-profiled OWC chambers<\/p>\n

          Mr. John Wesly (M.S) and Mr. Kartik Ruikar (B.Tech) –\u00a0Gap resonance in moonpools<\/p>\n

          Mr. Manish Verma (Ph.D) –\u00a0Wave-current loads on ships<\/p>\n

          Ms. Golda Percy (Ph.D) and Ms. Praba Nageswaran (Ph.D) and Mr. Sakthi Vasanth (Ph.D) –\u00a0Buffer blocks for coastal protection (dam-break waves ; solitons ; undular bores)<\/p>\n

          Mr. Vineesh P. (Ph.D) –\u00a0Twin floating-body dynamics<\/p>\n

          Dr. Jemi Jeya (Ph.D) – Regular waves interacting with pile-supported caisson<\/p>\n","protected":false},"excerpt":{"rendered":"

          Welcome to the homepage of IITM-RANS3D. It is an in-house CFD code developed at the Department of Ocean Engineering, IIT Madras. The code has been developed with the aim of handling complex wave-structure interaction simulations in large domains over a long period of time. IITM-RANS3D is a multiphase code based on the single-fluid formulation of […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":17,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"templates\/template-full.php","meta":{"footnotes":""},"class_list":["post-209","page","type-page","status-publish","hentry","post"],"_links":{"self":[{"href":"https:\/\/home.iitm.ac.in\/vsriram\/index.php\/wp-json\/wp\/v2\/pages\/209"}],"collection":[{"href":"https:\/\/home.iitm.ac.in\/vsriram\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/home.iitm.ac.in\/vsriram\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/home.iitm.ac.in\/vsriram\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/home.iitm.ac.in\/vsriram\/index.php\/wp-json\/wp\/v2\/comments?post=209"}],"version-history":[{"count":60,"href":"https:\/\/home.iitm.ac.in\/vsriram\/index.php\/wp-json\/wp\/v2\/pages\/209\/revisions"}],"predecessor-version":[{"id":319,"href":"https:\/\/home.iitm.ac.in\/vsriram\/index.php\/wp-json\/wp\/v2\/pages\/209\/revisions\/319"}],"up":[{"embeddable":true,"href":"https:\/\/home.iitm.ac.in\/vsriram\/index.php\/wp-json\/wp\/v2\/pages\/17"}],"wp:attachment":[{"href":"https:\/\/home.iitm.ac.in\/vsriram\/index.php\/wp-json\/wp\/v2\/media?parent=209"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}