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Philip Sorensen February 19, 2007 14:46

Consultant w/ Expertise in Aerodynamics & CFD
ATI is a small technology search firm. We initiate alliances between our clients, typically large companies seeking external technology or expertise, and outside firms or consultants that can help.

Here is the request --

Identification of Technical Consultants with Expertise in Aerodynamics and CFD Who can Identify Factors that Contribute to the Drag on Small, Non-symmetric Blunt Objects:

For a current project, we are seeking consultants with expertise in aerodynamics and CFD who can predict drag forces and identify specific geometric features contributing to the total drag (pressure and friction drag) on small (< 5" dia.) non-symmetric blunt objects of specific and detailed geometry (CAD models of multiple variants supplied). The goal is to analytically identify the detailed geometry having the lowest drag among multiple geometry variants and predict relative affects on speed. Objects are traveling at a velocity of approximately 100 mph and rotating at approximately 300 rpm (low speed, unsteady aerodynamics, standard atmosphere). The need is to be able to predict small changes in drag (total drag force is < 2 lbf, may need to resolve 1/10's of a lbf) caused by subtle changes in object shape that result in changes to speed of about 0.3%, for a constant propulsive input.

We are seeking experts who you capable of carrying out this analysis, and who further would be able to provide input into these questions:

Is this problem statement solvable given current state of the art in CFD and the difficulty of simulating turbulent flow? What is the level of difficulty on a scale of 1-10? What CFD code would you use?

Please let me know if you are interested and we can discuss or email next steps.

Thank you for your consideration.

== Advanced Technology Innovations, Inc. 100 Petaluma Blvd. N, #303 Petaluma, CA 94952 Ph: 707-285-2020 Fx: 707-988-2616 Email:

Glenn Horrocks February 19, 2007 17:24

Re: Consultant w/ Expertise in Aerodynamics & CFD

The analysis you describe looks possible. I would initially investigate whether RANS turbulence models would be accurate enough and if not move onto LES/DES/SAS simulations if required. CFX can do RANS, DES and SAS simulations well and can do LES simulations but is not optimised for it so if LES is required other codes may be better. Note that none of the major commercial codes are optimised for LES as it is quite a specialist area.

As for level of difficulty, if the RANS approach is acceptable then it is not too hard. DES and SAS can be setup easily in CFX but you will have quite a bit more validation work to do before you could be confident of the results. LES is significantly more difficult again.

Regards, Glenn Horrocks

madhao b bhambere February 27, 2007 03:42

Re: Consultant w/ Expertise in Aerodynamics & CFD
dear sir, my project is likely to be related to drag force @ lift force so we can do the discussion on it.

plz tell the required details.


reply me waiting!!!


Philip Sorensen February 27, 2007 18:06

Re: Consultant w/ Expertise in Aerodynamics & CFD
Glenn, forgive me if i've already responded directly to you...don't think so. do you or does your firm do this? if so, can you provide background and contact info? thank you! Best regards, -Phil

Glenn Horrocks February 27, 2007 22:12

Re: Consultant w/ Expertise in Aerodynamics & CFD
Hi Phil,

I live in Australia and I suspect you want a local consultant so I will pass on the opportunity. Good luck in finding a local consultant. I recommend you talk to your local ANSYS representative, they will probably either be able to do this sort of work or know people who can.

Glenn Horrocks

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