[GTP] [Fwd: Joint ASP-GTP Seminar-James Brasseur]

[Carolyn Mueller]

Just a reminder of this seminar.

-------- Original Message --------
Subject: 	Joint ASP-GTP Seminar-James Brasseur
Date: 	Mon, 13 Feb 2012 12:57:42 -0700
From: 	Carolyn Mueller <cmueller at ucar.edu>
To: 	gsp_staff at ucar.edu



Just a reminder of this seminar.


-------- Original Message --------
Subject: 	Re: Joint ASP-GTP Seminar-James Brasseur]
Date: 	Mon, 13 Feb 2012 12:00:17 -0700
From: 	Carolyn Mueller <cmueller at ucar.edu>
To: 	IMAGe Staff <image_staff at ucar.edu>, image_visitors at ucar.edu, 
image_seminars at ucar.edu
References: 	<4F3959B2.2090608 at ucar.edu>



Sorry, the date is Wednesday February 15.

Carolyn Mueller
NCAR IMAGe
1850 Table Mesa Drive 
Boulder, CO 80305 
www.image.ucar.edu 
Tel: 303 497-2491
Fax: 303-497-2483



Carolyn Mueller wrote:
> Just a reminder of this seminar.
>
> -------- Original Message --------
> Subject:     CHANGE OF DATE - Joint ASP-GTP Seminar-James Brasseur
> Date:     Tue, 24 Jan 2012 09:04:34 -0700
> From:     Carolyn Mueller <cmueller at ucar.edu>
> To:     IMAGe Staff <image_staff at ucar.edu>, image_visitors at ucar.edu, 
> image_seminars at ucar.edu
> References:     <4F185599.5070108 at ucar.edu>
>
>
>
> Carolyn Mueller
> NCAR IMAGe
> 1850 Table Mesa Drive Boulder, CO 80305 www.image.ucar.edu Tel: 303 
> 497-2491
> Fax: 303-497-2483
>
>
>
> Carolyn Mueller wrote:
>> Joint ASP GTP Seminar
>> Accuracy in LES Prediction of the Atmospheric Surface Layer: the SFS 
>> Stress Model, the Surface Stress Model, and Numerical Friction
>> James G. Brasseur
>> Professor of Mechanical Engineering, Bioengineering and Mathematics
>> Department of Mechanical Engineering
>> Pennsylvania State University
>> currently ASP Faculty Fellow at NCAR
>> Wednesday, February 15, 2012
>> Foothills Laboratory 2 (3450 Mitchell Lane), Room 1022
>> Lecture at 11:00am
>>
>>
>> In previous analysis we have presented a theory to address a basic 
>> difficulty that has plagued large-eddy simulation of turbulent 
>> boundary layers: the inability to predict the law-of-the-wall (LOTW) 
>> in mean velocity in the surface layer at high Reynolds numbers. 
>> Brasseur & Wei (Phys. Fluids 22) developed a theory that explains the 
>> source of the difficulty and a framework within which LES can be 
>> designed to rectify the problem. The essential difficulty lies in 
>> nonphysical frictional content within the discretized dynamical 
>> system and the extent to which that frictional content interferes 
>> with the inertial scaling that underlies LOTW. Practical models 
>> replace inertial flux with dissipative dynamics, so part of this 
>> frictional content enters through the subfilter-scale (SFS) model. 
>> However, this spurious content also enters through the surface stress 
>> model, the structure of the grid and dissipation within the numerical 
>> algorithm. I shall review briefly the essential nature of the 
>> difficulty and our proposed framework to overcome the error. I shall 
>> then discuss accuracy in context with the role of the SFS and surface 
>> stress models and prediction of the von Kármán constant, and the 
>> consequences of dissipation in the numerical algorithm. To 
>> demonstrate the effects we compare spectral LES with finite volume 
>> LES of the atmospheric boundary layer and rough-wall turbulent 
>> channel flow.
>>
>>
>>
>>
>
>


-- 
Carolyn Mueller
NCAR IMAGe
1850 Table Mesa Drive 
Boulder, CO 80305 
www.image.ucar.edu 
Tel: 303 497-2491
Fax: 303-497-2483




-- 
Carolyn Mueller
NCAR IMAGe
1850 Table Mesa Drive 
Boulder, CO 80305 
www.image.ucar.edu 
Tel: 303 497-2491
Fax: 303-497-2483