[Nek5000-users] Pipe with expansion

nek5000-users at lists.mcs.anl.gov nek5000-users at lists.mcs.anl.gov
Tue Jan 21 10:42:28 CST 2014


PS -  I actually don't know of a good way to find the
number of elements in each direction... so I normally
hard code that into the .usr file and then do a check
to make certain that at least the product nelx x nely x nelz = nelgv




On Tue, 21 Jan 2014, nek5000-users at lists.mcs.anl.gov wrote:

> 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
>>>>>>>>>>>>>> _______________________________________________
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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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