[Nek5000-users] Pipe with expansion
nek5000-users at lists.mcs.anl.gov
nek5000-users at lists.mcs.anl.gov
Wed Jan 22 09:37:39 CST 2014
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
>>>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>>>> Nek5000-users mailing list
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>>>>>>>>>>>>>> _______________________________________________
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>>>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>>>> Nek5000-users mailing list
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>>>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>>>> Nek5000-users mailing list
>>>>>>>>>>>>>> Nek5000-users at lists.mcs.anl.gov
>>>>>>>>>>>>>> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> --
>>>>>>>>>>>>>> Josh Camp
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> "All that is necessary for the triumph of evil is that
>>>>>>>>>>>>>> good men do nothing" -- Edmund Burke
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>>>> 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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