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Eddy-Break-Up in Reacfn.f and Sorent.f

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Old   November 27, 2001, 05:08
Default Eddy-Break-Up in Reacfn.f and Sorent.f
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Daniel
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I have been trying to expand the Eddy-Break-Up mode in prostar with a chemical model. Does anyone know how to call the routine for Eddy-Break-Up from within REACFN or SORENT? After trying to encode EBU myself the results obtained were different from the ones obtained using prostar.

Thanks, Daniel
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Old   November 27, 2001, 12:44
Default Re: Eddy-Break-Up in Reacfn.f and Sorent.f
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Ossi
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Hi,

I do not know how to call the Star routine. But, there are many types of Eddy Break-Up combustion models that can be implemented. Are you sure you implemented exactly the same model as the Star-Cd model ? For example, it makes sometimes a big difference if you take into account the product term in the minimum sentence or not.
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Old   November 28, 2001, 05:25
Default Re: Eddy-Break-Up in Reacfn.f and Sorent.f
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Daniel
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Thanks Ossi, Yes, I realize slight variations in the Eddy Break-Up are crucial, but I tried to follow the description in the methodology volume (with the product term). No variation I tried produced the desired results.
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Old   November 28, 2001, 14:10
Default Re: Eddy-Break-Up in Reacfn.f and Sorent.f
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Ossi
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What exactly are the differences between the built-in Eddy Break-Up model and your own coding ?
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Old   November 29, 2001, 04:57
Default Re: Eddy-Break-Up in Reacfn.f and Sorent.f
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Daniel
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I built a small model of 2x20 cells in which CH4 and air entered separately at one end and left at the other, I monitored the two models at the first cell by the air inlet and obtained small differences in temperature (about 1%) and larger differences in pressure (about 10%) there was almost no difference in species concentrations or turbulence parameters. In the full model I am solving the discrepancies are much more pronounced (due to the cumulative error I suppose). This could be a problem with the enthalpy source term in SORENT, but how can I test this?

Thanks, Daniel
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Old   November 30, 2001, 13:33
Default Re: Eddy-Break-Up in Reacfn.f and Sorent.f
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Ossi
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I am afraid I cannot help you much. Except to say that I have experinced difficulties with the usersubroutines in DEC machines. The runs crashed without any reasonable explanations with the reacfn.f subroutine. But this was with the v3100A, I think.

If you are sure that your programming does not differ from the built-in model, then you should contact the CD support in my opinion.

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Old   December 2, 2001, 05:21
Default Re: Eddy-Break-Up in Reacfn.f and Sorent.f
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Daniel
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Thanks Ossi, I have contacted the support, am awaiting thier reply

Daniel
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