[Nek5000-users] problem with 2d axisymmetric numerical simulation
nek5000-users at lists.mcs.anl.gov
nek5000-users at lists.mcs.anl.gov
Tue Jan 3 11:26:14 CST 2017
Hi SL,
Attached is an axisymmetric example that I've just set up.
Several subdomains are also possible, but you must pay attention
to the "A " bc.
Please let me know if the attached works and gives the right answer.
It looked ok, but I confess I didn't get out a paper and pencil to verify
that the answer is indeed correct....
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 03, 2017 10:07 AM
To: nek5000-users at lists.mcs.anl.gov
Subject: Re: [Nek5000-users] problem with 2d axisymmetric numerical simulation
Dear Paul,
thank you very much for your rapid response.
I have used 'A ' BC in the edge 1, however the problem persists... I am
wondering if the problem could be in how I have defined my geometry:
Is it necessary to define edge 1 as x \in [0,10]? Because I have defined
x \in [-2,8]...
Is it possible to generate edge 1 as a combination of several
subdomains? Because I have divided the geometry in 3 subdomains...
Thank you in advance.
SL
El 03-01-2017 14:38, nek5000-users at lists.mcs.anl.gov escribió:
> Dear SL,
>
> For axisymmetric, if the domain contains the axis, then only points
> along Edge 1
> are allowed to be on the axis. That means that the reference domain,
> shown
> here in the preprocessor notation,
>
> 3
> +-------------+
> | |
> 4 | | 2
> | |
> +-------------+
> 1
>
> must have Edge 1 on the axis and that the BC for edge 1 must be "A "
>
> If you generate your domain with genbox, this is easily accomplished
> with something like
> the following in a case.box file:
>
> your.rea
> 2 spatial dimension
> -1 number of fields
> #
> # comments
> #
> #
> #========================================================
> #
> Box
> -6 -4 nelx,nely,nelz for Box)
> 0 6 1.0 x0 x1 ratio
> 0 1 0.7 y0 y1 ratio
> P ,P ,A ,f , bc's
>
>
> 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 03, 2017 7:12 AM
> To: Nek5000 Users
> Subject: [Nek5000-users] problem with 2d axisymmetric numerical
> simulation
>
> Hi Neks,
>
> I am trying to simulate a circular pipe. To start with, I am trying to
> perform the 2d axisymmetric simulation. I have generated my mesh using
> gmsh, and then converted it to nek5000 format. The 2d numerical
> simulation is properly working, however, I am finding some troubles
> with
> the axisymmetric simulation.
>
> When I try to run my simulation, I find the following message, and the
> code stop running:
> read .rea file
> nelgt/nelgv/lelt: 1192 1192 200
> lx1 /lx2 /lx3 : 6 4 4
>
> mapping elements to processors
> 0 149 149 1192 1192 NELV
> 1 149 149 1192 1192 NELV
> 2 149 149 1192 1192 NELV
> 3 149 149 1192 1192 NELV
> 4 149 149 1192 1192 NELV
> 5 149 149 1192 1192 NELV
> 6 149 149 1192 1192 NELV
> 7 149 149 1192 1192 NELV
> RANK 0 IEG 474 475 476 477 478 479
> 480
> 481
> 482 483 484 485 486 487
> 488
> 489
> 490 492 493 494 495 496
> 497
> 498
> 499 500 501 502 503 504
> 505
> 506
> 507 508 510 511 512 513
> 514
> 515
> 516 517 518 519 520 521
> 522
> 523
> 524 525 526 528 529 530
> 531
> 532
> 533 534 535 536 537 538
> 539
> 540
> 541 542 543 544 546 547
> 548
> 549
> 550 551 552 553 554 555
> 556
> 557
> 558 559 560 561 562 565
> 566
> 567
> 568 569 570 571 572 573
> 574
> 575
> 576 577 578 579 580 583
> 584
> 585
> 586 587 588 589 590 591
> 592
> 593
> 594 595 596 597 598 602
> 603
> 604
> 605 606 607 608 609 610
> 611
> 612
> 620 621 622 623 624 625
> 626
> 627
> 628 639 640 641 642 643
> 644
> 657
> 658 659 660 676 677
> element load imbalance: 0 149 149
> done :: mapping elements to processors
>
> 0 objects found
> done :: read .rea file 0.25710E-01 sec
>
> setup mesh topology
> Element face on the axis of symmetry must be FACE 1
> Element 6 face 2 is on the axis.
> Element face on the axis of symmetry must be FACE 1
> Element 1 face 2 is on the axis.
> Element face on the axis of symmetry must be FACE 1
> Element 1 face 3 is on the axis.
> Right-handed check complete for 1192 elements. OK.
> Element face on the axis of symmetry must be FACE 1
> Element 2 face 2 is on the axis.
> Element face on the axis of symmetry must be FACE 1
> Element 1 face 2 is on the axis.
>
>
>
> Following this post:
> http://lists.mcs.anl.gov/pipermail/nek5000-users/2012-August/001906.html
>
> 1) I have set
> T IFAXIS
> T IFAZIV
> 2) I have set 'A ' BC in the region of y=0.
> 3) I have copied the FLUID BC to the region of THERMAL BOUNDARY
> CONDITIONS, modifying
> W, v and O by t
> 4) In the .usr file I have defined:
> c-----------------------------------------------------------------------
>> subroutine userf (ix,iy,iz,eg)
>> include 'SIZE'
>> include 'TOTAL'
>> include 'NEKUSE'
>> integer e,f,eg
>> if(y.gt.0) ffy = temp*temp/y
>> return
>> end
>> c-----------------------------------------------------------------------
>> subroutine userq (ix,iy,iz,eg)
>> include 'SIZE'
>> include 'TOTAL'
>> include 'NEKUSE'
>> integer e,f,eg
>> if(y.gt.0) then
>> visc = param(2)
>> qvol = -uy*temp/y
>> endif
>> return
>> end
>> c-----------------------------------------------------------------------
>> subroutine useric (ix,iy,iz,ieg)
>> include 'SIZE'
>> include 'TOTAL'
>> include 'NEKUSE'
>> temp = y
>> return
>> end
>> c-----------------------------------------------------------------------
>>
>
> Please, could you give me a piece of advise with this numerical
> simulation?
>
> Thank you very much in advance.
>
> SL
>
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