Calculating the mesh
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iker23
Apr 30, 2008, 6:10:07 AM4/30/08
to FDS and Smokeview Discussions
Hello!!
how can I calculate the appropriate number of cells in function of the
dimension of the mesh?
how can I calculate the appropriate number of cells in function of the
dimension of the mesh?
dr_jfloyd
Apr 30, 2008, 9:57:46 AM4/30/08
to FDS and Smokeview Discussions
If your question is "What mesh size should I use?", then see section
6.3.5 of the User's Guide.
6.3.5 of the User's Guide.
Kristopher Overholt
Apr 30, 2008, 11:49:27 AM4/30/08
to fds...@googlegroups.com
I wrote up some notes regarding the D* sizing method that is mentioned in the User Guide as well as other literature. It should help guide you in selecting an adequate cell size to start with based on the expected fire size in kW. You can view my notes here: http://docs.google.com/Doc?id=ajfdr2fw6926_39d4ft4q
Once you find a good cell sizing, you can also use a spreadsheet that I created to help you write out the mesh line for FDS. The link is on the FDS Third-Party Tools page here: http://fire.nist.gov/fds/thirdparty.html
Hope that helps.--
Kristopher James Overholt
Fire Protection Engineering Student
Senior at the University of Houston-Downtown
Secretary - Society of Fire Protection Engineers UHD Student Chapter
Once you find a good cell sizing, you can also use a spreadsheet that I created to help you write out the mesh line for FDS. The link is on the FDS Third-Party Tools page here: http://fire.nist.gov/fds/thirdparty.html
Hope that helps.
Kristopher James Overholt
Fire Protection Engineering Student
Senior at the University of Houston-Downtown
Secretary - Society of Fire Protection Engineers UHD Student Chapter
Kristopher Overholt
May 8, 2008, 1:45:05 PM5/8/08
to fds...@googlegroups.com
In response to yet another bug discovered in Excel for my MESH size calculation tool (thanks to Robert Peart in New Zealand for finding the error), I am abandoning Excel and I have recoded the MESH calculator in Python and posted it to be used by the FDS community on my website. Another benefit of this approach is that you don't need to download anything and all you need is a web browser to use the calculator.
The tool is available here: http://koverholt.com/?page_id=5 . The Third-Party links page on the FDS website will be updated by Bryan when he gets back in town.
What does it do? The MESH size calculator tool can be used to generate a single MESH line given x0, x1, y0, y1, z0, z1, and a desired uniform cell size. The benefit of the tool is that it finds Poisson-optimized IJK numbers based on the given dimensions (as described in section 6.3 of the User Guide) without the end user having to do so manually. Future versions of the calculator will include a feature to calculate the optimized IJK numbers for multiple meshes that will follow the new requirements imposed since FDS 5.1. My email address is on that web page if you encounter any errors or have suggestions.
Happy modeling!
KristopherFire Protection Engineering Graduate
The tool is available here: http://koverholt.com/?page_id=5 . The Third-Party links page on the FDS website will be updated by Bryan when he gets back in town.
What does it do? The MESH size calculator tool can be used to generate a single MESH line given x0, x1, y0, y1, z0, z1, and a desired uniform cell size. The benefit of the tool is that it finds Poisson-optimized IJK numbers based on the given dimensions (as described in section 6.3 of the User Guide) without the end user having to do so manually. Future versions of the calculator will include a feature to calculate the optimized IJK numbers for multiple meshes that will follow the new requirements imposed since FDS 5.1. My email address is on that web page if you encounter any errors or have suggestions.
Happy modeling!
Kristopher
szilagyics
May 9, 2008, 1:17:45 PM5/9/08
to FDS and Smokeview Discussions
You see the gridcoarse.xls file in files section http://groups.google.com/group/fds-smv/files
It is not enough nice,but usable.
On máj. 8, 19:45, "Kristopher Overholt" <koverh...@gmail.com> wrote:
> In response to yet another bug discovered in Excel for my MESH size
> calculation tool (thanks to Robert Peart in New Zealand for finding the
> error), I am abandoning Excel and I have recoded the MESH calculator in
> Python and posted it to be used by the FDS community on my website. Another
> benefit of this approach is that you don't need to download anything and all
> you need is a web browser to use the calculator.
>
> The tool is available here:http://koverholt.com/?page_id=5. The
It is not enough nice,but usable.
On máj. 8, 19:45, "Kristopher Overholt" <koverh...@gmail.com> wrote:
> In response to yet another bug discovered in Excel for my MESH size
> calculation tool (thanks to Robert Peart in New Zealand for finding the
> error), I am abandoning Excel and I have recoded the MESH calculator in
> Python and posted it to be used by the FDS community on my website. Another
> benefit of this approach is that you don't need to download anything and all
> you need is a web browser to use the calculator.
>
> Third-Party links page on the FDS website will be updated by Bryan when he
> gets back in town.
>
> What does it do? The MESH size calculator tool can be used to generate a
> single MESH line given x0, x1, y0, y1, z0, z1, and a desired uniform cell
> size. The benefit of the tool is that it finds Poisson-optimized IJK numbers
> based on the given dimensions (as described in section 6.3 of the User
> Guide) without the end user having to do so manually. Future versions of the
> calculator will include a feature to calculate the optimized IJK numbers for
> multiple meshes that will follow the new requirements imposed since FDS 5.1.
> My email address is on that web page if you encounter any errors or have
> suggestions.
>
> Happy modeling!
>
> Kristopher
>
> On Wed, Apr 30, 2008 at 10:49 AM, Kristopher Overholt <koverh...@gmail.com>
> gets back in town.
>
> What does it do? The MESH size calculator tool can be used to generate a
> single MESH line given x0, x1, y0, y1, z0, z1, and a desired uniform cell
> size. The benefit of the tool is that it finds Poisson-optimized IJK numbers
> based on the given dimensions (as described in section 6.3 of the User
> Guide) without the end user having to do so manually. Future versions of the
> calculator will include a feature to calculate the optimized IJK numbers for
> multiple meshes that will follow the new requirements imposed since FDS 5.1.
> My email address is on that web page if you encounter any errors or have
> suggestions.
>
> Happy modeling!
>
> Kristopher
>
> wrote:
>
>
>
> > I wrote up some notes regarding the D* sizing method that is mentioned in
> > the User Guide as well as other literature. It should help guide you in
> > selecting an adequate cell size to start with based on the expected fire
> > size in kW. You can view my notes here:
> >http://docs.google.com/Doc?id=ajfdr2fw6926_39d4ft4q
>
> > Once you find a good cell sizing, you can also use a spreadsheet that I
> > created to help you write out the mesh line for FDS. The link is on the FDS
> > Third-Party Tools page here:http://fire.nist.gov/fds/thirdparty.html
>
> > Hope that helps.
>
>
>
>
> > I wrote up some notes regarding the D* sizing method that is mentioned in
> > the User Guide as well as other literature. It should help guide you in
> > selecting an adequate cell size to start with based on the expected fire
> > size in kW. You can view my notes here:
> >http://docs.google.com/Doc?id=ajfdr2fw6926_39d4ft4q
>
> > Once you find a good cell sizing, you can also use a spreadsheet that I
> > created to help you write out the mesh line for FDS. The link is on the FDS
> > Third-Party Tools page here:http://fire.nist.gov/fds/thirdparty.html
>
> > Hope that helps.
>
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