Plot logarithms of values in Smokeview

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Please incorporate a way to have Smokeview plot the logarithm of
concentrations, mole fractions or mass fractions rather than the magnitude?
Frequently, one is interested in very small concentration quantities
that don't show up well when simply contouring values between 0 and 1.

Original issue reported on code.google.com by robert.m...@colostate.edu on 12 Jun 2009 at 2:18

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I will take a look at it.  

Note, as a work around you can use the Set Bounds dialog box to zoom in on the 
small
data values.

Original comment by gfor...@gmail.com on 12 Jun 2009 at 8:03

• Changed state: Accepted
• Added labels: Priority-Low, Type-Enhancement
• Removed labels: Priority-Medium, Type-Defect

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Original comment by gfor...@gmail.com on 12 Jun 2009 at 8:03

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Glenn,

This is a nice suggestion.  A couple of thoughts have occurred to me

-Any SLCF or BNDF QUANTITY that is negative (or zero but that special case 
could be
worked around) would not work when you go to take a log.  Would you envision 1)
checking the data bounds and not allowing a check box for Log in Set Bounds if 
there
were negative values or 2) some parameter written to the smv by FDS to indicate 
if
the QUANTITY could be used with Log?

-Do we attempt to limit how low the logs go or leave that up to the user?  For
example if I were looking at soot, I would "believe" FDS values of E-9 to E-6 
for
mass fraction, but a value like E-20 would have no real meaning (number could 
be as
much due to numerical error/round off as actual transport).

Original comment by drjfloyd on 12 Jun 2009 at 8:22

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are there logical FDS quantities where a log would make sense? ie a quantity 
that now
ranges from 0.0 to 1.0 .  Would  one want to take logs of other quantities?  

I'll have to think about your questions.  I agree that I wouldn't trust a E-20 
value.

I do something similar now letting the user change units from say degrees C to 
dgrees
F.  However, I don't actually change data values, all I do is change colorbar 
labels.
 I'm wondering whether I can shoehorn this request into a unit change.

Original comment by gfor...@gmail.com on 12 Jun 2009 at 9:25

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As I think about this, gas concentrations (or mass fractions) and perhaps 
velocity
(magnitude not component) and the absorption coefficient are about the only 
units
where I could see wanting a log scale.  

Original comment by drjfloyd on 15 Jun 2009 at 6:33

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Low concentrations, especially related to toxic substances are the ones where
logarithmic levels are of concern.  Toxic products often result from burning of
plastics or other petrochemical products.  Radioactive gases can also be 
produced
during nuclear fires which are dangerous at low concentrations. Odors produced 
by
fires are also typically important at low concentrations, and can be produced or
distributed by fire scenarios.  Finally, in these days of terrorist concerns and
biological weapons there may be an application for FDS and Smokeview where low
concentrations of biological products are important.  

Original comment by robert.m...@colostate.edu on 15 Jun 2009 at 7:29

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Just a few quick ones that I can think of are:
DROPLET DIAMETER
HRR
HRRPUV
STRAIN RATE (X, Y, and Z)
MIXING TIME

Original comment by williams...@gmail.com on 16 Jun 2009 at 1:44

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Original comment by gfor...@gmail.com on 22 Oct 2009 at 6:46

• Changed state: OnHold

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think the best place to take a logarithm of data is in FDS

Original comment by gfor...@gmail.com on 12 Apr 2011 at 2:50

• Changed state: WontFix