Fds Mesh Size Calculator - Kristopher Overholt 6s5g50

FDS Mesh Size Calculator - Kristopher Overholt

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FDS Mesh Size Calculator NOTE: You should always perform a grid sensitivity analysis and the grid resolution yourself. This calculator should only be used as a guide / rule of thumb!

Enter the x, y, z dimensions (meters) and your expected HRR

Xmin

  Xmax

Ymin

  Ymax

Zmin

  Zmax

Heat Release Rate (Q) kW

Density (p∞)

1.204

kg / m3

Specific Heat ()

1.005

kJ / kg-K

Ambient Temperature (T∞)

293

K

http://www.koverholt.com/fds-mesh-size-calc/[05/07/2015 15:39:02]

FDS Mesh Size Calculator - Kristopher Overholt

Gravity (g)

9.81

m / s2

Calculate suggested cell sizes »

To use the old MESH Size Calculator, click here

About this tool This tool allows you to easily generate a MESH line for input into Fire Dynamics Simulator (FDS). It automatically calculates the optimal (Poisson-friendly) mesh division numbers and returns a complete MESH line to be used in an FDS input fle. The cell sizes are determined using the characteristic fre diameter and cell size ratio that should accurately resolve your fre simulation based on the total heat release rate.

Background The cell size (dx) for a given simulation can be related to the characteristic fre diameter (D*), i.e., the smaller the characteristic fre diamater, the smaller the cell size should be in order to adequately resolve the fuid fow and fre dynamics. The characteristic fre diameter (D*) is given by the following relationship:

http://www.koverholt.com/fds-mesh-size-calc/[05/07/2015 15:39:02]

FDS Mesh Size Calculator - Kristopher Overholt

A reference within the FDS Guide (Verifcation and Validation of Selected Fire Models for Nuclear Power Plant Applications. NUREG 1824, United States Nuclear Regulatory Commission, 2007) used a D*/dx ratio between 4 and 16 to accurately resolve fres in various scenarios. From the FDS Guide: “These values were used to adequately resolve plume dynamics, along with other geometrical characteristics of the models as well. This range does not indicate what values to use for all models, only what values worked well for that particular set of models.” For more information, see the FDS Guide Section 6.3 or visit the offcial NIST FDS Website. The FDS Mesh Size Calculator is powered by the free and open source tool Python, and the source code is freely available here. Please me regarding any bug reports or comments.

About I am a software engineer at Continuum Analytics who works with scientifc software development and scientifc computing.

@koverholt Tweets by @koverholt

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FDS Mesh Size Calculator - Kristopher Overholt

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