[Nek5000-users] Configure a stress at boundary

[nek5000-users at lists.mcs.anl.gov]

Thank you Aleks!
It works.

Peng

> On Jun 17, 2016, at 1:00 PM, nek5000-users-request at lists.mcs.anl.gov wrote:
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>   1. Configure a stress at boundary (nek5000-users at lists.mcs.anl.gov)
>   2. Re: Configure a stress at boundary
>      (nek5000-users at lists.mcs.anl.gov)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Fri, 17 Jun 2016 14:33:22 +0000
> From: nek5000-users at lists.mcs.anl.gov
> To: "nek5000-users at lists.mcs.anl.gov"
> 	<nek5000-users at lists.mcs.anl.gov>
> Subject: [Nek5000-users] Configure a stress at boundary
> Message-ID:
> 	<mailman.23977.1466174696.24727.nek5000-users at lists.mcs.anl.gov>
> Content-Type: text/plain; charset="utf-8"
> 
> Dear Neks,
> 
> I am simulating a water flow in the 3dbox example.
> In order to simulate the wind blowing over the water, I hope to add a wind stress at the top boundary.
> The wind stress (tau) formulation is given as
> tau = rho*C_d*U*U
> where tau is the wind stress, rho is the air density, C_d is the drag coefficient, and U is the wind speed.
> I guess the wind stress should be configured in ?userbc?, but how to do it? Can anyone help?
> 
> Thank you!
> Peng
> 
> 
> 
> *************************
> Peng Wang, Ph.D.
> 
> Postdoctoral Associate
> Department of Ocean Sciences
> Rosenstiel School of Marine and Atmospheric Science
> University of Miami
> 4600 Rickenbacker Causeway
> Miami, Florida 33149-1098, USA
> 
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Fri, 17 Jun 2016 16:31:38 +0000
> From: nek5000-users at lists.mcs.anl.gov
> To: "nek5000-users at lists.mcs.anl.gov"
> 	<nek5000-users at lists.mcs.anl.gov>
> Subject: Re: [Nek5000-users] Configure a stress at boundary
> Message-ID:
> 	<mailman.23994.1466181101.24727.nek5000-users at lists.mcs.anl.gov>
> Content-Type: text/plain; charset="Windows-1252"
> 
> Hi Peng,
> 
> We have looked a bit into this type of boundary condition of Nek5000 stress-formulation -- you need to set boundary condition character in .box file (or choose prenek' option) to 
> 
> 'shl'
> 
> (which probably stands for stress-horizontal-local) and set NEKUSE's the horizontal stress components to tr1 and tr2 in userbc. 
> 
> Aleks
> 
> ________________________________________
> From: nek5000-users-bounces at lists.mcs.anl.gov [nek5000-users-bounces at lists.mcs.anl.gov] on behalf of nek5000-users at lists.mcs.anl.gov [nek5000-users at lists.mcs.anl.gov]
> Sent: Friday, June 17, 2016 9:33 AM
> To: nek5000-users at lists.mcs.anl.gov
> Subject: [Nek5000-users] Configure a stress at boundary
> 
> Dear Neks,
> 
> I am simulating a water flow in the 3dbox example.
> In order to simulate the wind blowing over the water, I hope to add a wind stress at the top boundary.
> The wind stress (tau) formulation is given as
> tau = rho*C_d*U*U
> where tau is the wind stress, rho is the air density, C_d is the drag coefficient, and U is the wind speed.
> I guess the wind stress should be configured in ?userbc?, but how to do it? Can anyone help?
> 
> Thank you!
> Peng
> 
> 
> 
> *************************
> Peng Wang, Ph.D.
> 
> Postdoctoral Associate
> Department of Ocean Sciences
> Rosenstiel School of Marine and Atmospheric Science
> University of Miami
> 4600 Rickenbacker Causeway
> Miami, Florida 33149-1098, USA
> 
> 
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