From: Burge, F \(Frances\) (firstname.lastname@example.org)
Date: Thu Jan 26 2006 - 16:35:04 CET
Hello Fluka users,
I'm trying to define a mixture of H2 and CO gas at 0.1 atmospheres
pressure. Is the following approach correct?
First I define CO, using the MATERIAL card to give its density at 0.1
atm, followed by the COMPOUND card giving atom relative contents of C
and O in the compound.
I then use another MATERIAL card to define the density of the H2/CO
mixture again at 0.1 atm, followed by the COMPOUND card giving the mass
fractions of H2 and CO in the mixture.
(Since H, C and O are in the list of pre-defined materials I have not
changed their definitions, including density).
Now according to the notes about MAT-PROP card in the manual, gas
pressure is set to 1 atmosphere if the density is <0.01 (true in this
case). Since I have defined the densities already at 0.1 atm, do I also
need to include a MAT-PROP card with WHAT(1) = 0.1 to do the calculation
correctly at 0.1atm? Or should I have left the densities in the MATERIAL
cards as the atmospheric pressure values, and then used a MAT-PROP card
to correct them?
All advice gratefully received,
Diamond Light Source Ltd.
Rutherford Appleton Laboratory
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