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ShipFlow - xchap, vof command file help? Post-processing to Tecplot

xchap vof

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#1 Mr. Iorga Stefan

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Posted 20 January 2016 - 08:08 AM

Dear friends,

 

Before jumping mailing Flowtech's support, I might get better chances to get quicker answers here.

 

My first 3 trials using XCHAP, without VOF, converged eventually, although not being enable to post-process the results using Tecplot (SHIPFLOWPOSTPROC = TECPLOT is declared in the Windows system environment variables). The command file and the error looks like error_tecplot.JPG

Using XOFFGEN I generated the offset file, up to the deckline, removed bow group, but extracted the stem profile from it and included the station into the bulb group. Is there any way I can declare all the groups in the command file without altering XOFFGEN generated file? Or maybe the instruction offs ( iges = "name.igs" ...) without declaring groups at all?

 

I was instructed to use an IGES hull and "VOF" instruction in the command file (in order to capture the free surface), and it's deck extruded with construction height and then generate with XOFFGEN the offset file offsets.JPG and I get negative volume cells, and some other times, errors regarding "not enough memory"

 

To summarize, can someone provide an example of a command file using an IGES file and VOF altogether?

 

Later edit: And what is that error in Tecplot?

 

Thank you very much!

 

Best regards,

Stefan

 

PS: We are using ShipFlow 6.xx release, on a 12 GB memory Windows machine


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#2 Mr. Daehwan Park

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Posted 20 January 2016 - 09:34 AM

Hi Iorga

 

I am not an advanced user of SHIPFLOW but I think there we Need some corrections in the command file.

 

Xflow

 

- hull : Add "Vof"

- hull : Erase higr, ogrp, fbgr and abgr

 

 

I am not sure this will solve the Problem but hope it would be worthy to try.

If not solved, this issue should be managed by FLOWTECH Support including Tecplot error.

 

Hope this could be help.

 

Daehwan


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#3 Mr. Iorga Stefan

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Posted 20 January 2016 - 11:26 AM

Thanks for the reply - I've got this (is a new error at least :-)

 

-Running XOFFGEN

 
Translating xchap_test3.igs -> xchap_test3.stl
Hull type: mono
Creating Groups:
- main  ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
||||||||||||||||||||||
- bulb  |||||||||||||||||||||||||||||||||
- aft   |||||||||||||||||||||||||
- boss  |||||||||||||
- bow   |||||||||||||||||
Offset file written to: C:\Users\Administrator\Desktop\XCHAP_test_3\off_xchap_test3
done.
 
 
SHIPFLOW 6.0.00 ( Revision: 10369 )
Educational license
 
Licensed under the SHIPFLOW EDUCATIONAL LICENSE AGREEMENT
--- To be used only in academic education ---
 
-Running XBOUND
 
-Running XGRID
 *This seems to be a full scale case and
 the default grid dimentions for XGRID are for model
 scale. Please consider adding 50% extra cells in
 the normal direction (ZETAMAX).
  **ERROR in ant.f. # of points in spline to large
forrtl: severe (157): Program Exception - access violation
Image              PC                Routine            Line        Source
 
xflow.exe          000000013FEF74A0  Unknown               Unknown  Unknown
                   3FDB9A3790C9D1A7  Unknown               Unknown  Unknown
                   3FDB9BF717BE562F  Unknown               Unknown  Unknown
  
....
 
                   3FE9915DE8D81EE0  Unknown               Unknown  Unknown
                   3FE9BA885C9F8481  Unknown               Unknown  Unknown
                   3FE9E3B2D066EA21  Unknown               Unknown  Unknown
                   3FEA0CDD442E4FC2  Unknown               Unknown
 
Stack trace buffer overflow; further frames not shown.
error_xflow.JPG
  
Regardless (ZETAMAX) - it say there are too many points on the stations?
 
Here is the command file generated by ShipFlow after all that above:
 
xflo
  titl(titl="tk_100.7_XCHAP")
  prog(all)
  hull(mono,vof,h1gr="main",fbgr="bulb",abgr="boss",ogrp="aft")
  offs(xaxd=-1,ysig=1,xori=100.7,zori=6.5,lpp=100.7,file="../off_xchap_test3")
  vshi(rn=[6.365814030131828e08],fn=[0.237373050372614])
  flui(dens=1025,visc=1.18e-006,grav=9.806649999999999)
  prto(strl)
  opti(on)
  control(exepath="C:\FLOWTECH\SHIPFLOW6.0.00-x86_64\bin\..\\bin/",runid="C:\Users\Administrator\Desktop\XCHAP_test_3\tk7000_RUN_DIR",rundir="C:\Users\Administrator\Desktop\XCHAP_test_3\tk7000_RUN_DIR",casedir="C:\Users\Administrator\Desktop\XCHAP_test_3")
end
xgri
  size(vcoa,glob)
  offs(h1gr="main",fbgr="bow",abgr="boss",ogrp="aft")
end
xcha
  para(nthr=4,npro=1)
  cont(star,tecp,adi,maxi=8000)
  vof(rhor=0.01)
end
 
Thank you,
Stefan

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#4 Mr. Daehwan Park

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Posted 20 January 2016 - 12:26 PM

Well, I don't know well but I think you Need to check first if the Offset Group was created correctly.......... and try to enlarge grid size from vcoa to a larger.

 

And please Keep in mind that Flowtech People can help you much better :).

 

Daehwan


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#5 Mr. Iorga Stefan

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Posted 20 January 2016 - 12:40 PM

Well, I don't know well but I think you Need to check first if the Offset Group was created correctly.......... and try to enlarge grid size from vcoa to a larger.

 

And please Keep in mind that Flowtech People can help you much better :).

 

Daehwan

 

Eventually, I will do that, you're right.

 

Thank you for your assistance.

 

Best regards,

Stefan


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#6 Mr. Iorga Stefan

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Posted 22 January 2016 - 04:08 AM

Sorry, wanted to post a thing, but found the solution.

 

This reply should be erased.

 

Thank you

 

Edited


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#7 Ms. Madalina Oprea

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Posted 08 August 2017 - 07:21 AM

Hello Mr Iorga Stefan,

I encounter the same problem with xchap, when the results converged. The error looks like this: xchap.exe stopped working and when I close this window the message received is Shipflow core execution failed. The point when the writing of analysis is stopped is when: exported node centered solution to project_name_XCHAP.plt. Can you tell what was the problem in your case?

 

Thank you in advance

.


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