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Area of Interest 11 - Coarse GridModeling

Published on AidPage by IDILOGIC on Jun 24, 2005
Administered by:

Department of Energy, All Departmental Locations, All DOE Federal Offices
(see all US Federal Agencies)

Explore all postings for this grant program:
  • Original Grant - May 25, 2005
Applications Due:

Jul 7, 2005

total funding: Not Available
max award: none
min award: none
cost sharing, matching: Yes
number of awards: Not Available
type of funding: Grant

NOTE - Registration Requirements: As part of theDepartment?s implementationof e-Government, WE ARE REQUIRING THE SUBMISSION OF APPLICATIONS THROUGHGRANTS.GOV. There are several one-time actions you must complete in ordertosubmit an application through Grants.gov (e.g., obtain a Dun and BradstreetData Universal Numbering System (DUNS) number, register with the CentralContractor Registration (CCR), register with the credential provider andregister with Grants.gov). You must complete all the one-time actions in?GetStarted? at www.Grants.gov prior to submitting your initial application.APPLICANTS, WHO ARE NOT REGISTERED WITH CCR AND GRANTS.GOV, SHOULD ALLOW ATLEAST 14 DAYS TO COMPLETE THESE REQUIREMENTS. It is suggested that theprocessbe started as soon as possible.Area of Interest 11 - Coarse Grid ModelingTwo-fluid model simulations of chemically reacting dense gas-solids systemsrequire a large number of computational cells to accurately resolve thehydrodynamic features. However, such an approach for large scale systemse.g.,the transport gasifier at the PSDF (http://psdf.southernco.com/index.html)isnot practical with today?s computers. Recent work has focused on thedevelopment of a sub-grid scale model that would allow a modeler to use acoarse grid with a sub-grid scale model for the gas-solids drag to accountforthe loss of hydrodynamic information due to the coarse grid. This approachwasdeveloped by considering a single representative computational cell withinanoverall two-dimensional simulation. This cell is then resolved with a veryfinegrid with periodic boundary conditions. Simulations of this cell are thenperformed and statistical data is collected to show the effect of gridresolution on the gas-solids drag coefficient.To use this approach for simulations on a scale similar to that of thetransport gasifier at PSDF, or larger, the earlier two-dimensional workwouldneed to be extended to three-dimensions to develop reliable coarse-grainedforms of the two-fluid models and boundary conditions that average over theeffects of small scale fluctuations, e.g. with filter lengths of 100 to1000particle diameters and commensurate temporal filters. The attributes ofsuchcoarse-grained models should lead to grid-size independent solutions withcoarser grids and larger time steps, and these solutions should representaccurately the macro-scale flow characteristics obtained in highly resolved(fine grid) two-fluid model simulations. The 2-D sub-grid modelconstitutiveequations and methodologies are available from the work referenced at thebottom.DOE is interested in research that will extend the 2-D sub-grid concept tothree-dimensions and demonstrate the coarse-grained forms for various termsinthe two-fluid model, and develop fundamentally based filter-size dependentclosed form closures for them or devise a validated computational approachtodetermine them. The methodology is as important as the final closed formequations, as two-fluid models continue to evolve and one should be able toadapt the methods developed in this research to improved two-fluid modelsasand when they become available. Sub-grid model validation will be done withfine grid comparisons to be done by the developer for simpleconfigurations.Large scale validation of such coarse-grained equations will bedemonstratedthrough comparison with highly resolved (fine grid) simulations of thestartingtwo-fluid model equations on meaningful test problems by NETL.To link to the master announcement DE-PS26-05NT42472-00, please click thefollowing link:https://e-center.doe.gov/iips/faopor.nsf/UNID/AFDC3E3018D30D1C8525700C005DB010?OpenDocument

Who can apply:

Anyone/General Public
Other Private Institution/Organization
Private Institutions Of Higher Education
Public And State Controlled Institutions Of Higher Education

Eligible functional categories:
Funding Sources:

University Coal Research

More Information:

Click here to view the Opportunity

If you have problems accessing the full announcement, please contact: using thislink
If you have problems accessing the full announcement, please contact: Raymond Johnson

Address Info:

U.S. Department of Energy, National Energy TechnologyLaboratory, 3610 Collins Ferry Road (MS-I07) P.O. Box 880 Morgantown, WV26507-0880

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