Skip to content

FDS Source: add OXIDATIVE HRRPUA solid phase output. Issue #13664 #13667

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
ericvmueller merged 1 commit into from
Oct 31, 2024
Merged

FDS Source: add OXIDATIVE HRRPUA solid phase output. Issue #13664 #13667

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
3 changes: 2 additions & 1 deletion Manuals/FDS_User_Guide/FDS_User_Guide.tex
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2868,7 +2868,7 @@ \subsection{Reaction Rates}
\be
X_{\rm O_2}(x) = X_{\rm O_2,f}\exp(-x/L_{\rm g})
\ee
where $L_{\rm g}$ is the gas diffusion length scale and $X_{\rm O_2,f}$ is computed to satisfy simultaneous mass transfer and solid phase reaction rates (see FDS Tech Guide \cite{FDS_Math_Guide}). $n_{{\rm O_2},ij}$ is prescribed under the name {\ct N\_O2(j)} on the {\ct MATL} line of the $i$th material. It is zero by default. $L_{\rm g}$ is prescribed under the name {\ct GAS\_DIFFUSION\_DEPTH(j)}, and it is 0.001 m by default.
where $L_{\rm g}$ is the gas diffusion length scale and $X_{\rm O_2,f}$ is computed to satisfy simultaneous mass transfer and solid phase reaction rates (see FDS Tech Guide \cite{FDS_Math_Guide}). $n_{{\rm O_2},ij}$ is prescribed under the name {\ct N\_O2(j)} on the {\ct MATL} line of the $i$th material. It is zero by default. $L_{\rm g}$ is prescribed under the name {\ct GAS\_DIFFUSION\_DEPTH(j)}, and it is 0.001 m by default. The heat release rate per unit area associated with oxidation reactions can be output using the solid phase {\ct QUANTITY} called {\ct 'OXIDATIVE HRRPUA'}. This is an integral in depth of the contributions from all reactions and all materials for a given solid surface.

You can specity {\ct MAX\_REACTION\_RATE(j)} (\si{kg/m^3.s}) to limit the reaction rate, $r_{ij}$, below a specified value.

Expand Down Expand Up @@ -11472,6 +11472,7 @@ \section{Solid Phase Output Quantities}
{\ct NORMALIZED HEAT RELEASE RATE} & Section~\ref{info:material_components} & W/g & D \\ \hline
{\ct NORMALIZED MASS}$^4$ & Section~\ref{info:material_components} & & D \\ \hline
{\ct NORMALIZED MASS LOSS RATE}$^4$ & Section~\ref{info:material_components} & 1/s & D \\ \hline
{\ct OXIDATIVE HRRPUA} & Section~\ref{sec:reaction_rates} & \unit{kW/m^2} & B,D \\ \hline
{\ct PRESSURE COEFFICIENT} & Section~\ref{info:pressure_coefficient} & & B,D \\ \hline
{\ct RADIATIVE HEAT FLUX} & Section~\ref{info:heat_flux} & \unit{kW/m^2} & B,D \\ \hline
{\ct RADIOMETER} & Section~\ref{info:heat_flux} & \unit{kW/m^2} & B,D \\ \hline
Expand Down
4 changes: 4 additions & 0 deletions Source/data.f90
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1604,6 +1604,10 @@ SUBROUTINE DEFINE_OUTPUT_QUANTITIES
OUTPUT_QUANTITY(-79)%SHORT_NAME = 'O2_iter'
OUTPUT_QUANTITY(-79)%BNDF_APPROPRIATE = .TRUE.

OUTPUT_QUANTITY(-80)%NAME = 'OXIDATIVE HRRPUA'
OUTPUT_QUANTITY(-80)%UNITS= 'kW/m2'
OUTPUT_QUANTITY(-80)%SHORT_NAME = 'hrrpua_O2'

! Condensation
OUTPUT_QUANTITY(-100)%NAME = 'CONDENSATION HEAT FLUX'
OUTPUT_QUANTITY(-100)%UNITS= 'kW/m2'
Expand Down
2 changes: 2 additions & 0 deletions Source/dump.f90
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -9252,6 +9252,8 @@ REAL(EB) FUNCTION SOLID_PHASE_OUTPUT(INDX,Y_INDEX,Z_INDEX,PART_INDEX,OPT_WALL_IN
CASE(79) ! SURFACE OXYGEN ITERATIONS
SOLID_PHASE_OUTPUT = 0
IF (SF%INCLUDE_BOUNDARY_PROP2_TYPE) SOLID_PHASE_OUTPUT = B2%Y_O2_ITER
CASE(80) ! OXIDATIVE HRRPUA
SOLID_PHASE_OUTPUT = B1%Q_DOT_O2_PP*0.001_EB

CASE(100) ! CONDENSATION HEAT FLUX
SOLID_PHASE_OUTPUT = B1%Q_CONDENSE * 0.001_EB
Expand Down
1 change: 1 addition & 0 deletions Verification/WUI/char_oxidation_1.fds
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -79,6 +79,7 @@
&VENT MB='ZMAX',SURF_ID='OPEN' /

&DEVC XB=-0.5, 0.5,-0.5,0.5,0.0,3.0, QUANTITY='MPUV', PART_ID='foliage part', ID='mass foliage', SPATIAL_STATISTIC='VOLUME INTEGRAL' /
&DEVC XB=-0.5, 0.5,-0.5,0.5,0.0,3.0, QUANTITY='OXIDATIVE HRRPUA', PART_ID='foliage part', ID='char hrr', SPATIAL_STATISTIC='SURFACE INTEGRAL' /

&TAIL /