[Nek5000-users] Pipe with expansion
nek5000-users at lists.mcs.anl.gov
nek5000-users at lists.mcs.anl.gov
Wed Jan 22 09:53:42 CST 2014
Axial viscous stress is given by torq_calc -- that's no problem whatsoever. You get a number as a
function of time.
You can even get stresses on multiple subsets of the geometry (e.g., if you had multiple branches
in the domain or multiple cylinders. The drag, which is a byproduct of the torque computation (which
you can ignore), is given in terms of the viscous and pressure components separately and as the
sum of the two.
You can identify domain boundaries by checking the boundary conditions. Here, I recommend
looking at the set_obj routines in several of the /example cases.
________________________________________
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: Wednesday, January 22, 2014 9:37 AM
To: nek5000-users at lists.mcs.anl.gov
Subject: Re: [Nek5000-users] Pipe with expansion
Hello Paul
I was thinking about taking the tangential velocity near to the wall so that I can figure out my length of the recirculation region.
Is it possible for me to access the boundary elements of the mesh ??? so that I can take the boundary element and then obtain the velocity at that point so that I can figure out the length of my recirculation region.
or take the *.fld file and read it to plot the datas I need.
I also want to calculate the axial viscous force acting on the entire pipe.
which is given by
C_v = F^v / ( d^2 * rho * U^2 ) = double integral ( 1/Re * (du / dr) ) dtheta dz
On Jan 22, 2014, at 4:07 PM, nek5000-users at lists.mcs.anl.gov wrote:
>
> Hi Kamal,
>
> As I thought about it some more, if you're interested in the local wall shear stress
> magnitude I'm quite certain you can get this by plotting the magnitude of vorticity
> on the surface in question. (Note that the sign of the WSS, which in fact is a tensor
> or a vector when restricted to a given surface, is lost in this process, but that might
> not be relevant for your needs.) If that works, then you can readily compute the
> vorticity using one of the routines in nek and store the result in a velocity field, then
> view that field with VisIt. Of course WSS will require multiplication by viscosity.
>
> hth,
>
> Paul
>
> ________________________________________
> 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: Tuesday, January 21, 2014 10:33 AM
> To: nek5000-users at lists.mcs.anl.gov
> Subject: Re: [Nek5000-users] Pipe with expansion
>
> Hi paul,
>
> can I make this to be drag or shear quantities to be return to the a
> separate file so that it will easy for me to plot.
>
> By the way it gives the integral quantity. Think for example I need to
> find the shear stress on the wall from the inlet to outlet at a
> particular time = 2 . How can I do that ?
>
> Is there way to find the number of elements in x,y and z direction ?
>
> On 21/01/2014 17:32, nek5000-users at lists.mcs.anl.gov wrote:
>>
>> Hi Kamal,
>>
>> Your integrated drag quantities should be written to the logfile
>> (stdout),
>> assuming you've set the arguments in the call to be .true.
>>
>> Paul
>>
>> On Tue, 21 Jan 2014, nek5000-users at lists.mcs.anl.gov wrote:
>>
>>> Hi Paul,
>>>
>>> I checked the set_obj subroutine and implemented one in my .USR file.
>>> The code seem to run without any errors but I don't find where these
>>> variables are getting stored.
>>>
>>> I use VisIT to visualize my output, even there was no change in it.
>>>
>>> do I have to define my own output file and write the variables out ?
>>>
>>> Thanks,
>>>
>>> Kamal.
>>>
>>>
>>> On 20/01/2014 21:52, nek5000-users at lists.mcs.anl.gov wrote:
>>>>
>>>> Hi Kamal,
>>>>
>>>> You'll need to compute your own tke by manipulating the
>>>> velocity fields.
>>>>
>>>> You can get running averages of the requisite quantities
>>>> via calls to "avg_all" which is found in navier5.f
>>>>
>>>> You can compute shear stress on the wall simply by computing
>>>> the drag on the wall, which can be done via a call to torque_calc(),
>>>> also found in navier5.f
>>>>
>>>> If you cd to /examples and type:
>>>>
>>>> grep torq */*.usr
>>>>
>>>> you'll find many examples of calls to torque_calc. You simply
>>>> need to prescribe the surfaces on which shear is to be integrated.
>>>>
>>>> I typically write a routine "set_obj" to identify such surfaces
>>>> on the first call to usrchk.
>>>>
>>>> grep set_obj */*.usr
>>>>
>>>> will show similar examples.
>>>>
>>>> I would recommend trying this for laminar Poiseiulle flow in
>>>> a very simple channel just to check that your calls are properly
>>>> set.
>>>>
>>>> Best,
>>>>
>>>> Paul
>>>>
>>>>
>>>> On Mon, 20 Jan 2014, nek5000-users at lists.mcs.anl.gov wrote:
>>>>
>>>>> Hi Paul,
>>>>>
>>>>> Thanks and that helped.
>>>>>
>>>>> Where can I find the variables like Turbulent KE , shear stress on
>>>>> the wall. ?
>>>>>
>>>>> Do i have to activate some parameters for calculating them ?
>>>>>
>>>>> If I had to plot them.
>>>>>
>>>>> Thanks,
>>>>> Kamal
>>>>>
>>>>>
>>>>> On Jan 20, 2014, at 5:41 AM, nek5000-users at lists.mcs.anl.gov wrote:
>>>>>
>>>>>>
>>>>>> Kamal,
>>>>>>
>>>>>> Looks good.
>>>>>>
>>>>>> I'm guessing that one further refinement would be:
>>>>>>
>>>>>> if (z.gt.z0) scale = 1 + (smax-1)*(z-z0)/(z1-z0)
>>>>>> if (z.gt.z1) scale = smax
>>>>>>
>>>>>> which would yield
>>>>>>
>>>>>> scale = 1 when z=z0
>>>>>> scale = smax when z >= z1
>>>>>>
>>>>>> Paul
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Sun, 19 Jan 2014, nek5000-users at lists.mcs.anl.gov wrote:
>>>>>>
>>>>>>> Hi paul,
>>>>>>>
>>>>>>> The code works fine, but there should be a small change thats has
>>>>>>> to be done
>>>>>>>
>>>>>>>
>>>>>>> if (z.gt.z0) scale = 1 + (z /(z1-z0 )))
>>>>>>> if (z.gt.z1) scale = smax
>>>>>>>
>>>>>>> This creates a perfect diverging pipe.
>>>>>>>
>>>>>>> Thanks for the help paul.
>>>>>>>
>>>>>>> Kamal
>>>>>>>
>>>>>>> On Jan 20, 2014, at 12:09 AM, nek5000-users at lists.mcs.anl.gov wrote:
>>>>>>>
>>>>>>>> Hi paul,
>>>>>>>>
>>>>>>>> If I am not wrong,
>>>>>>>> I make a mesh with three straight pipes( inlet, divergent,
>>>>>>>> outlet ) connected together via n2to3 so that I know the element
>>>>>>>> connectivity places of the divergent section (z0,z1) and use the
>>>>>>>> section what you gave
>>>>>>>>
>>>>>>>> Thank you for the code
>>>>>>>>
>>>>>>>> Kamal
>>>>>>>>
>>>>>>>> On Jan 19, 2014, at 8:45 PM, nek5000-users at lists.mcs.anl.gov wrote:
>>>>>>>>
>>>>>>>>>
>>>>>>>>> Kamal,
>>>>>>>>>
>>>>>>>>> I would do the following in usrdat2():
>>>>>>>>>
>>>>>>>>> n=nx1*ny1*nz1*nelt
>>>>>>>>>
>>>>>>>>> do i=1,n
>>>>>>>>> x=xm1(i,1,1,1)
>>>>>>>>> y=ym1(i,1,1,1)
>>>>>>>>> z=ym1(i,1,1,1)
>>>>>>>>> scale = 1.
>>>>>>>>> if (z.gt.z0) scale = smax*(z-z0/(z1-z0)
>>>>>>>>> if (z.gt.z1) scale = smax
>>>>>>>>> xm1(i,1,1,1) = scale*x
>>>>>>>>> ym1(i,1,1,1) = scale*y
>>>>>>>>> enddo
>>>>>>>>>
>>>>>>>>> Paul
>>>>>>>>>
>>>>>>>>> Make certain that z1 and z0 correspond to z values
>>>>>>>>> that precisely coincide with element interfaces.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Sun, 19 Jan 2014, nek5000-users at lists.mcs.anl.gov wrote:
>>>>>>>>>
>>>>>>>>>> Hi Paul,
>>>>>>>>>>
>>>>>>>>>> I looked into the Peris example but It is so what same like
>>>>>>>>>> the stenosis example with a Cosine deformation.
>>>>>>>>>>
>>>>>>>>>> In my case it is a pipe with conical divergent. I tried to
>>>>>>>>>> play around the variables Xm1, Ym1 and Zm1 but the mapping
>>>>>>>>>> doesn't go well.
>>>>>>>>>>
>>>>>>>>>> Could you please help me with this.
>>>>>>>>>>
>>>>>>>>>> Thank you,
>>>>>>>>>>
>>>>>>>>>> Kamal
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Jan 18, 2014, at 7:26 PM, nek5000-users at lists.mcs.anl.gov
>>>>>>>>>> wrote:
>>>>>>>>>>
>>>>>>>>>>> Hi Paul,
>>>>>>>>>>>
>>>>>>>>>>> I looked at the Helix and stenosis example but they are using
>>>>>>>>>>> cosine functions to deform
>>>>>>>>>>>
>>>>>>>>>>> I tried to use a tangent function but it bends the whole pipe.
>>>>>>>>>>>
>>>>>>>>>>> I dint look at peris example .
>>>>>>>>>>>
>>>>>>>>>>> I will take a look at it and let you know.
>>>>>>>>>>>
>>>>>>>>>>> Thank you
>>>>>>>>>>>
>>>>>>>>>>> Kamal
>>>>>>>>>>>
>>>>>>>>>>> On Jan 18, 2014, at 7:22 PM, nek5000-users at lists.mcs.anl.gov
>>>>>>>>>>> wrote:
>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> Kamal,
>>>>>>>>>>>>
>>>>>>>>>>>> Have you looked at the peris example? The usr file there
>>>>>>>>>>>> shows how to deform
>>>>>>>>>>>> a pipe geometry.
>>>>>>>>>>>>
>>>>>>>>>>>> Paul
>>>>>>>>>>>>
>>>>>>>>>>>> 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: Saturday, January 18, 2014 12:17 PM
>>>>>>>>>>>> To: nek5000-users at lists.mcs.anl.gov
>>>>>>>>>>>> Subject: Re: [Nek5000-users] Pipe with expansion
>>>>>>>>>>>>
>>>>>>>>>>>> Dear Paul,
>>>>>>>>>>>>
>>>>>>>>>>>> I tried many ways to map my straight pipe geometry but it
>>>>>>>>>>>> does not seem to work properly
>>>>>>>>>>>>
>>>>>>>>>>>> I used something like
>>>>>>>>>>>>
>>>>>>>>>>>> X = X + Z * tan ( alpha )
>>>>>>>>>>>> Y = Y + Z* tan (alpha )
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> even that dint work. could please help me with this
>>>>>>>>>>>>
>>>>>>>>>>>> Thank you
>>>>>>>>>>>>
>>>>>>>>>>>> Kamal.
>>>>>>>>>>>>
>>>>>>>>>>>> On Jan 17, 2014, at 2:24 PM, nek5000-users at lists.mcs.anl.gov
>>>>>>>>>>>> wrote:
>>>>>>>>>>>>
>>>>>>>>>>>>> Hi Paul,
>>>>>>>>>>>>>
>>>>>>>>>>>>> Thanks paul. I tried working with the diverging mesh
>>>>>>>>>>>>> modification.
>>>>>>>>>>>>>
>>>>>>>>>>>>> I tried to use this form of equation to modify the mesh
>>>>>>>>>>>>>
>>>>>>>>>>>>> z = mx + b
>>>>>>>>>>>>> z = ny + c
>>>>>>>>>>>>>
>>>>>>>>>>>>> x = ( z - b ) / m
>>>>>>>>>>>>> y = (z - c) / n
>>>>>>>>>>>>>
>>>>>>>>>>>>> Do you think would work ? or is there any other way to
>>>>>>>>>>>>> input that ?
>>>>>>>>>>>>>
>>>>>>>>>>>>> Thanks,
>>>>>>>>>>>>>
>>>>>>>>>>>>> Kamal
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> On 17/01/2014 14:14, nek5000-users at lists.mcs.anl.govwrote:
>>>>>>>>>>>>>> Kamal,
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> 1) To check for convergence, run your simulation for
>>>>>>>>>>>>>> increasing polynomial orders ( lx1 in the SIZE file) and
>>>>>>>>>>>>>> measure some consistent quantity (drag, TKE, etc). You
>>>>>>>>>>>>>> can plot this quantity against lx1 and this should give
>>>>>>>>>>>>>> you a good picture of how you are converging (without
>>>>>>>>>>>>>> needing to change the physical mesh).
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> 2) If you weren't using temperature in your simulation,
>>>>>>>>>>>>>> you could do put the following code snippet in your userchk
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> c-------------------------------------------
>>>>>>>>>>>>>> integer i, ntot
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> ntot = nx1*ny1*nz1*nelv ! total number of points in
>>>>>>>>>>>>>> simulation (on THIS processor)
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> do i = 1,ntot
>>>>>>>>>>>>>> t(i,1,1,1,1) = 0.5*(vx(i,1,1,1)**2 + vy(i,1,1,1)**2 +
>>>>>>>>>>>>>> vz(i,1,1,1)**2)
>>>>>>>>>>>>>> enddo
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> ifto = .true.
>>>>>>>>>>>>>> c-------------------------------------------
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> I've assumed here that your density is unity. This
>>>>>>>>>>>>>> computed kinetic energy point-wise and stores it in the
>>>>>>>>>>>>>> temperature field. The part "ifto = .true." tells Nek to
>>>>>>>>>>>>>> output the temperature field whenever it outputs a field
>>>>>>>>>>>>>> file. You could then view this in visit just like you
>>>>>>>>>>>>>> would the velocity field.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Hope this helps!
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Josh
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> On Wed, Jan 15, 2014 at 9:52 AM,
>>>>>>>>>>>>>> <nek5000-users at lists.mcs.anl.gov> wrote:
>>>>>>>>>>>>>> Hi Paul,
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> I will try that mapping, I created a straight pipe to do
>>>>>>>>>>>>>> some simulations.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> 1) Is there a way to check my spectral convergence, so
>>>>>>>>>>>>>> that I can do some mesh convergence study?
>>>>>>>>>>>>>> 2) Is there a way to plot the kinetic energy in the flow ?
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Thank you,
>>>>>>>>>>>>>> Kamal
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> On 15/01/2014 12:14, nek5000-users at lists.mcs.anl.gov wrote:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Hi Kamal,
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> For the geometry you describe, I would apply mesh morphing
>>>>>>>>>>>>>> to a standard straight pipe. You can create such a pipe
>>>>>>>>>>>>>> using a subset of the mkmesh script provided in the expansion
>>>>>>>>>>>>>> example.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> If your transition region is conical, then I woud make
>>>>>>>>>>>>>> certain that the change in slope occurs at element
>>>>>>>>>>>>>> boundaries,
>>>>>>>>>>>>>> i.e., as in the half cross-section depicted below:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> _______________
>>>>>>>>>>>>>> /| | |
>>>>>>>>>>>>>> / | | |
>>>>>>>>>>>>>> /| | | |
>>>>>>>>>>>>>> ________________/ | | | |
>>>>>>>>>>>>>> | | | | | | | |
>>>>>>>>>>>>>> | | | | | | | |
>>>>>>>>>>>>>> +-----+-----+---+--+---+------+------+----> z
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Paul
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> On Wed, 15 Jan 2014, nek5000-users at lists.mcs.anl.gov wrote:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Hi Paul,
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> I looked at the example and it looks very helpful, but for
>>>>>>>>>>>>>> a sudden expansion we have only two parts (i.e) the inlet
>>>>>>>>>>>>>> pipe and the outlet pipe. Whereas in a diverging pipe we
>>>>>>>>>>>>>> have three section (i.e,) The inlet pipe, Diverging
>>>>>>>>>>>>>> section and the outlet pipe.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Is it possible for me to create a 2D diverging section
>>>>>>>>>>>>>> using mesh modification and revolve it around the centre
>>>>>>>>>>>>>> axis to get a 3d diverging pipe ?
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> or should I apply the mesh modification directly to the 3d
>>>>>>>>>>>>>> sudden expansion pipe using usrdat2() ?
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Thanks,
>>>>>>>>>>>>>> Kamal
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> On 14/01/2014 21:09, nek5000-users at lists.mcs.anl.gov wrote:
>>>>>>>>>>>>>> Hi Paul,
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Thanks a lot for the update. I will take a look at as soon
>>>>>>>>>>>>>> as possible and keep you updated with it.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Thank you,
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Kamal
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> On Jan 14, 2014, at 9:04 PM,
>>>>>>>>>>>>>> nek5000-users at lists.mcs.anl.gov wrote:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Kamal,
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> I've added an example for a step-type expansion in a pipe.
>>>>>>>>>>>>>> New example directory
>>>>>>>>>>>>>> is nek5_svn/examples/expansion, with a README.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> If you want a standard diffuser, I would use
>>>>>>>>>>>>>> mesh-morphing, as outlined in the
>>>>>>>>>>>>>> nek primer, which can be found on this page:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> http://nek5000.mcs.anl.gov/index.php/UG#Documentation
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> I've also automated our turbulent outflow bc treatment --
>>>>>>>>>>>>>> one simply provides an
>>>>>>>>>>>>>> expansion factor (typically ~ 1.5) and two persistent
>>>>>>>>>>>>>> arrays to turb_outflow(), which
>>>>>>>>>>>>>> is now in navier5.f. This can be useful when very
>>>>>>>>>>>>>> strong vortices are leaving the
>>>>>>>>>>>>>> domain, which is possible for certain diffuser flow
>>>>>>>>>>>>>> conditions (and others).
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Paul
>>>>>>>>>>>>>> ________________________________________
>>>>>>>>>>>>>> From: nek5000-users-bounces at lists.mcs.anl.gov
>>>>>>>>>>>>>> [nek5000-users-bounces at lists.mcs.anl.gov] on behalf
>>>>>>>>>>>>>> ofnek5000-users at lists.mcs.anl.gov
>>>>>>>>>>>>>> [nek5000-users at lists.mcs.anl.gov]
>>>>>>>>>>>>>> Sent: Monday, January 13, 2014 3:35 AM
>>>>>>>>>>>>>> To: nek5000-users at lists.mcs.anl.gov
>>>>>>>>>>>>>> Subject: [Nek5000-users] Creating a Mesh
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Hi
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Can some one please help me in this because I am new to nek
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> 1) How can I create a .rea for a specific geometry say ' A
>>>>>>>>>>>>>> sudden
>>>>>>>>>>>>>> expansion pipe ' or a ' Diverging pipe '
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> 2) What tool I should use to create that mesh.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Thank you
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> kamal
>>>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>>>> Nek5000-users mailing list
>>>>>>>>>>>>>> Nek5000-users at lists.mcs.anl.gov
>>>>>>>>>>>>>> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
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>>>>>>>>>>>>>> _______________________________________________
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>>>>>>>>>>>>>> _______________________________________________
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>>>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>>>> Nek5000-users mailing list
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>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> --
>>>>>>>>>>>>>> Josh Camp
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> "All that is necessary for the triumph of evil is that
>>>>>>>>>>>>>> good men do nothing" -- Edmund Burke
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> _______________________________________________
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>>>>>>>>>>>>>
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