WARNING: MATL FOAM, REAC 1. No product yields (NUs) set

[luca.mi...@gmail.com]

Hi,

I am trying to simulate a case study where there is not a fire, but a surface with a prescribed NET_HEAT_FLUX.

The simulation seems to work fine and match with the analytic solution, but unfortunately I get this warning:

WARNING: MATL FOAM, REAC 1. No product yields (NUs) set

Should I simply ignore it? or it is related with some problem that can affect my simulation?

Thank you

[Randy McDermott]

I would not ignore it.  If you have specified a reaction then you probably need the right yields.

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[luca.mi...@gmail.com]

I don't have a specified reaction in my case, cause I don't have a fire during a simulation, but a surface with a prescribed NET_HEAT_FLUX, and I want to see how much is the incident_heat_flux on another surface caused by the one with the prescribed NET_HEAT_FLUX. I have posted the fds file.

Do I need to prescribe it anyway?

[Randy McDermott]

I would.  You can specify a null reaction.  -1, 1 for the coefficients.

On Sun, Jun 30, 2019 at 2:54 PM <luca.mi...@gmail.com> wrote:

I don't have a specified reaction in my case, cause I don't have a fire during a simulation, but a surface with a prescribed NET_HEAT_FLUX, and I want to see how much is the incident_heat_flux on another surface caused by the one with the prescribed NET_HEAT_FLUX. I have posted the fds file.

Do I need to prescribe it anyway?

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[dr_jfloyd]

You have specified a MATL reaction and that reaction needs NU values. If you don't want to do combustion get rid of the HEAT_OF_COMBUSTION on the MATL as that input isn't needed in this case. Then have the MATL reaction change the FOAM to AIR. This way your mass of FOAM will decrease over time.