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  3. Problems with openLabs

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Problems with openLabs

sriluta
sriluta over 2 years ago

Hey,

iam using OpenLabs because my inlet boundary conditions change with the time and the azimuth angle in the unsteady Simulation.  So OpenLabs works with SI Units. In the first time, I defined the pressure in bar ( since didn't know that OpenLabs works with SI Units and there the pressure is defined in pascal ). So with the following function implemented in OpenLabs  for the absolut total pressure I didn't got Problems: 

 3.853 + (-0.9863)*cos(tCoord*1.966 + 2*PI*Time/timePeriod) + 0.08183*sin(tCoord*1.966+ 2*PI*Time/timePeriod) + (-0.2735)*cos(tCoord*3.932+ 2*PI*Time/timePeriod) + 0.6356*sin(tCoord*3.932+ 2*PI*Time/timePeriod) + 0.588*cos(tCoord*5.88 + 2*PI*Time/timePeriod) + (-0.1489)*sin(tCoord*5.88 + 2*PI*Time/timePeriod) + (-0.07768)*cos(tCoord*7.864 + 2*PI*Time/timePeriod) + (-0.2232)*sin(tCoord*7.864 + 2*PI*Time/timePeriod) + (-0.3242)*cos(tCoord*9.83 + 2*PI*Time/timePeriod) + 0.01536*sin(tCoord*9.83 + 2*PI*Time/timePeriod) + 0.1678*cos(tCoord*11.796+ 2*PI*Time/timePeriod) + 0.2214*sin(tCoord*11.796 + 2*PI*Time/timePeriod) + 0.1408*cos(tCoord*13.762 + 2*PI*Time/timePeriod) + (-0.0754)*sin(tCoord*13.762+ 2*PI*Time/timePeriod) + (-0.1216)*cos(tCoord*15.728 + 2*PI*Time/timePeriod) + (-0.1922)*sin(tCoord*15.728 + 2*PI*Time/timePeriod)

when I found out that OpenLabs works in SI units, I converted the sizes from bar to pascal and created the new following function: 

390101.438+ (−99956.492)*cos(1.963*tCoord + 2*PI*Time/timePeriod)+ 9062.116*sin(1.963*tCoord + 2*PI*Time/timePeriod)+ (−26626.657)*cos(3.927*tCoord + 2*PI*Time/timePeriod)+63969.754*sin(3.927*tCoord + 2*PI*Time/timePeriod)+57284.906*cos(5.890*tCoord + 2*PI*Time/timePeriod) + (−15828.864)*sin(5.890*tCoord + 2*PI*Time/timePeriod) + (−8525.752)*cos(7.854*tCoord + 2*PI*Time/timePeriod) + (−21014.003)*sin(7.854*tCoord + 2*PI*Time/timePeriod) + (−30331.247)*cos(9.817*tCoord + 2*PI*Time/timePeriod)+2857.566*sin(9.817*tCoord + 2*PI*Time/timePeriod)+15956.411*cos(11.781*tCoord + 2*PI*Time/timePeriod)+19562.181*sin(11.781*tCoord + 2*PI*Time/timePeriod)+11641.815*cos(13.744*tCoord + 2*PI*Time/timePeriod) + (−6956.443)*sin(13.744*tCoord + 2*PI*Time/timePeriod) + (−10933.721)*cos(15.708*tCoord + 2*PI*Time/timePeriod) + (−14834.89)*sin(15.708*tCoord + 2*PI*Time/timePeriod). 

If I click in OpenLabs at validate labs everything is fine, if I start the Simulation, the Simulation stops from beginning and say there is a problem with OpenLabs. I also defined the functions for the absolut Total Temperature and arctg( Vt/Vz) and there are no Problems but just with the pressure. Now I dont know what to do,

greetings Slight smile

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  • Dianliang
    +1 Dianliang over 2 years ago in reply to sriluta

    You must  provide the information of the boundary that will be customized. Otherwise, OpenLabs cannot know which boundary needs to be changed.

    The "Inlet" in FineOpen tutorial is the name of the boundary.

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  • sriluta
    0 sriluta over 2 years ago in reply to Dianliang

    thx for your response, ah okay not only the boundary condition needs to be named, the boundary too. I want to modify the absolute total pressure and absolut total temperature at the inlet too, therefore i will use the name of the boundary conditions and the boundary inlet too, thx

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