MODIFICATION
A -- R&D for Computational Analysis
- Notice Date
- 4/6/2010
- Notice Type
- Modification/Amendment
- NAICS
- 541712
— Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)
- Contracting Office
- Department of Commerce, National Institute of Standards and Technology (NIST), Acquisition Management Division, 100 Bureau Drive, Building 301, Room B129, Mail Stop 1640, Gaithersburg, Maryland, 20899-1640
- ZIP Code
- 20899-1640
- Solicitation Number
- NB866050-A-04269
- Archive Date
- 4/24/2010
- Point of Contact
- Richard Cordero, Phone: 3019753976, WILLIAM N. LI, Phone: 3019753955
- E-Mail Address
-
rcordero@nist.gov, William.Li@nist.gov
(rcordero@nist.gov, William.Li@nist.gov)
- Small Business Set-Aside
- Total Small Business
- Description
- The purpose of amendment one (1) is to posted questions and answers: Questions for Solicitation NB866050-A-04269 CFD: 1.Can NIST provide geometry (CAD) files for the respirator so that we can better assess the modeling details prior to submitting a proposal? If these are not available, can NIST provide a representative drawing and cross section of the respirator to be modeled? There are a variety of different styles available in the marketplace. A.The respirator to be modeled is an SCBA used by firefighters and other first responders. Geometry files will be posted to the NIST ftp site by COB 6 April. 2.Will NIST be able to supply the filter characteristics for the CFD analysis? A.This is an SCBA, so no filters are involved. 3.Will opening and closing of valves (duration and amount) be defined a priori, or will these depend on the pressures/flowrates determined by the analysis? A.Valves will be opened and closed a priori for this study, with different boundary conditions for the inhalation and exhalation phases. 4.What is the gas to be considered? Is it a single-phase, single species flow problem or is multiphase or multi-species analysis required? Are there any solid particles to be included? A.In this study only a single-phase, single species gas without particulates will be modeled. 5.Are temperature effects to be included? Vapor condensation? A.No temperature effects or vapor condensation will be considered in this study. 6.Are properties (composition, temperature, etc.) of inhaled gas to be assumed identical to the properties of the exhaled gas? A.Yes. 7.Is leakage a concern ? If it is, how is it defined ? A.Leakage will not be considered in this study. Structural: 1.Will modeling of gross sliding of the mask over the face be required? In other words, is the mask slid over the face (e.g. from the forehead to the chin), or is it pushed onto the face and straps placed over the head to secure the respirator? Simulation of the former is more challenging than the latter. A.It is anticipated that the mask will be pushed onto the face from a position directly in front of the face, in the same way that it would be donned by a real user. Only the seal need be modelled, with rigid boundaries where the seal is attached to the facepiece. In this study, the nosecup will be ignored and only the outer seal will be considered. Because of the shapes of the seal and the face, sliding will be required in order to bring the seal into full contact with forehead, cheeks, and chin.
- Web Link
-
FBO.gov Permalink
(https://www.fbo.gov/spg/DOC/NIST/AcAsD/NB866050-A-04269/listing.html)
- Record
- SN02114435-W 20100408/100406235611-8a2108400b2637f836a3a6203bb30335 (fbodaily.com)
- Source
-
FedBizOpps Link to This Notice
(may not be valid after Archive Date)
| FSG Index | This Issue's Index | Today's FBO Daily Index Page |