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Guidance or tutorial of applying pseudo-material method

  1. Oct 24, 2016 #1
    Hi, I'm working on a project of coupled simulation involving MCNP and Fluent, and having trouble with how to apply the pseudo-material method in cross section handling. Is there any related material or tutorial? Or, does anyone know the procedure of applying the method and what kind of files the method actually modifies(e.g. xsdir or the material card in mcnp input file)?
     
  2. jcsd
  3. Oct 29, 2016 #2
    Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
     
  4. Oct 30, 2016 #3
    The pseudo-material method modifies the MCNP material card in the MCNP input file. One would change the number density of the entries to reach an approximate mixture of materials with the same cross section as the desired material.

    Eg if you wanted Lithium at 500 degrees and only had cross sections at 400 and 600 then you would add a fraction of both the 400 and 600 degree cross section.

    There is an equation for finding the fraction of materials to add when making the pseudo-material http://neams.rpi.edu/jiw2/papers/ANS 92 Conlin.pdf

    Are you planning on using pseudo-materials to get cross sections for particular temperatures? If so perhaps look at on the fly doppler broadening instead
    http://www.casl.gov/docs/Martin.OTF.MC2013.Final.pdf

    However sorts of questions are often answered on the MCNP email forum
    https://laws.lanl.gov/vhosts/mcnp.lanl.gov/mcnp_forum.shtml
     
  5. Oct 30, 2016 #4
    Thanks for your reply. I've read about the solution I was looking for and the OTF method you mentioned in other expertises. I think pseudo-material method should be sufficient in solving my problem but there's still a lot of work to be done for me to realize the method with scripts written with c++. Again, thanks for your help.
     
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