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TOPIC: Forcing period

Forcing period 10 years 4 months ago #13449

  • lmuteau
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Hi,

I am working on Harbor oscillation (seiche) using ARTEMIS and I have realized my liquid boundary is forced only at the begining of my simulation.

Is there a way to force a swell on a larger period in ARTEMIS ?


In my .cas file, I already use this :
WAVE PERIOD = 16.


PERIOD SCANNING : OUI
BEGINNING PERIOD FOR PERIOD SCANNING : 4.
ENDING PERIOD FOR PERIOD SCANNING : 800.
STEP FOR PERIOD SCANNING : 4.

DIRECTION OF WAVE PROPAGATION : 270.D0

But, one more time, liquid boundaries are only forced for first frames, I would like it more longer.

Hope this has'nt been already asked,

Regards

Loïc
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Forcing period 10 years 4 months ago #13451

  • CP
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Hi Loïc,

ARTEMIS works under harmonic hypothesis in frequency domain. Are there is no "evolution" or time stepping, I don't really understand what you mean by 'begining' of the simualtion.

If you use the period scanning then ARTEMIS will perform N simulations with various incident wave periods, here from 4 to 800s... Do you call "first frames" the smallest periods ?

Regards,

Christophe
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Forcing period 10 years 4 months ago #13453

  • lmuteau
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Hi Christophe,

It would be simpler with some pictures

begining.jpg


later.jpg


On the first one, I can see swell coming from northern boundary, wich i asked for.
On the second one, 30 sec later, there is no more swell coming, only agitation and resonnance on my domain.

I would like to know if it is possible to force a swell not only at the beginin of my simulation but all my period scanning long.


Regards,

Loïc
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Forcing period 10 years 4 months ago #13454

  • CP
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HI Loïc,

I guess you're presenting the wave height in the first picture, right?
Are you sure you present the wave height in the second one?
Did you looked at the scale ? What are the min / max on your picture, how does it suit to the incident wave height ?

ARTEMIS should impose the same wave height and only change the period. A test to see if there is a bug in the period scanning would be to try to impose the Tmin+30s period to a single period case, just to check.

If you send me your case, I run it today or next wednesday.

which version are you using?

Regards,

Christophe
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Forcing period 10 years 4 months ago #13457

  • lmuteau
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Yes, both figures present same parameter, and it's surface height, not wave height, my bad. By looking at the legend (with wave height parameter) the swell has 1m50+ amplitude even if I fixed 1m in my .f file.

If you want to check, i'm using v6p3 version.


Best regards,

Loïc

File Attachment:

File Name: port_tudy_test.cli
File Size: 59 KB


File Attachment:

File Name: port_tudy_test.slf
File Size: 368 KB


File Attachment:

File Name: seiche.f
File Size: 9 KB
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Forcing period 10 years 4 months ago #13458

  • lmuteau
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Oops I forgot a file, here it comes. Sorry for double-post, i didn't find "edit"


File Attachment:

File Name: port_tudy_test.cas
File Size: 2 KB


Regards
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Forcing period 10 years 4 months ago #13465

  • OGW
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Your .cli file contains LIHBOR values (first column) of 5, which I didn't think were used in Artemis, only 1,7,4 and 2.
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Forcing period 10 years 4 months ago #13468

  • lmuteau
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Hi OGW,

Indeed, my .cli file contained an error, yet I made it with BlueKenue.

However, I manually switched this column with 4, but the problem is still there, the swell seems to stop after few seconds.

Here the evolution at a point in the harbor where i expect 1m amplitude and a seiche period of 4-5 min. We can see an agitation at the begining and then it stop.
waterheigh.jpg
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Forcing period 10 years 4 months ago #13471

  • OGW
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I'm not sure what you are expecting but I don't think the x-axis from the results of period scanning has units of time, rather each period simulated, see the Artemis manual

'... ARTEMIS performs a calculation for each of the periods specified. The results are stored in the results file (with period sampling if the key word GRAPHIC PRINTOUT PERIOD is used).'
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Forcing period 10 years 4 months ago #13485

  • lmuteau
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Hi,

Indeed, I misunderstood ... I though about forcing a wave period and see what happens in my harbor for a duration. Thank you for having opened my eyes.


Regards

Loïc
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