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  3. transient table in openlabs?

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transient table in openlabs?

sriluta
sriluta 11 months ago

Hello together,

iam doing an unsteady Simulation with Omnis. At the inlet iam simulating among others the total temperature as you can see in the picture. The total temperature changes with the azimuth angle theta and the time. So far I reconstructed the points with the fourier series and inplemented in openLabs. Is it also possible to insert a transient table in openlabs as I see an example in the documentary? 

Tt(theta, time) = 1650 + (-112)*cos(1.9*tCoord - PI*Time/timePeriod) + 4*sin(1.9*tCoord - PI*Time/timePeriod) and with the other terms.  TimePeriod is the time, the shockwave needs to travel around the annulus of my axial turbine.

greetings Hussein

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  • Colinda
    0 Colinda 11 months ago

    Hi Hussein,
    If you wish to define the temperature as a function of theta and time using a table, I don't think OpenLabs is needed.

    Did you already look into the possibility to use the Profile manager? You can create a .csv file with your data. 

    If that does not meet your requirements, could you please explain why not?

    Best regards,
    Colinda

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  • sriluta
    0 sriluta 11 months ago in reply to Colinda

    Hi Colinda, 

    thx for your answer. Didn't see this option before,  but how can I also define then the timePeriod, the time the shockwave needs to travel around the annulus?  I think I have to pre-calculate the temperature values incorporating the phase shift and that's it?

    greetings Hussein

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  • Colinda
    0 Colinda 11 months ago in reply to sriluta

    Hi Hussein,

    As you can see in the documentation of the Profile manager, you can define a .csv file that will have a header like this:

    time, theta, temperature

    Then you add points of the temperature profile in function of theta for the first time t1, then the profile for a next time t2, etc.

    t1 theta11 T11

    t1 theta12 T12

    t1 theta13 T13

    ...

    t2 theta21 T21

    t2 theta22 T22

    t2 theta23 T23

    ...

    So you have a "grid" of points covering the theta range at the inlet, and define the temperature values for the points of this grid, at each computed time.

    I hope this helps to set up your profile?

    Best regards,
    Colinda

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  • sriluta
    0 sriluta 11 months ago in reply to Colinda

    Hi Colinda, exactly thx. Just need to know, how to define the header for arct(Vt/Vz) ( angle from axial direction). Maybe just arct(Vt/Vz) ? 

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  • Colinda
    0 Colinda 11 months ago in reply to sriluta

    For the quantity to impose, like arct(Vt/Vz) you can use a simple name like flowangle.

    I never use special characters like ( or / in the profile header. It seems to work though.

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