The ambient concentration level reflecting actual air quality as monitored or modeled ... [http://www.arb.ca.gov/DRDB/TUO/CURHTML/R102.HTM]
Ambient : Surrounding (for example, ambient air). [http://www.atsdr.cdc.gov/glossary.html]
Concentration : The amount of a substance present in a certain amount of soil, water, air, food, blood, hair, urine, breath, or any other media.
[http://en.mimi.hu/environment/concentration.html]
Concentration : The relative amount of a substance mixed with another substance. An example is five parts per million of carbon monoxide in air or 1 milligram/liter of iron in water.
[http://en.mimi.hu/environment/concentration.html]
Contaminant : A substance that is either present in an environment where it does not belong or is present at levels that might cause harmful (adverse) health effects.
[http://www.atsdr.cdc.gov/glossary.html#Exposure%20Pathway]
[http://www.atsdr.cdc.gov/glossary.html#G-A-]
“Background concentration” means the ambient concentration of a
given parameter upstream or upgradient from a facility, practice or activity
which has not been affected by that facility, practice or activity.
[http://www.owrb.ok.gov/util/rules/pdf_rul/background_def.pdf]
Exposure pathway
The route a substance takes from its source (where it began) to its end point (where it ends), and how people can come into contact with (or get exposed to) it. An exposure pathway has five parts: a source of contamination (such as an abandoned business); an environmental media and transport mechanism (such as movement through groundwater); a point of exposure (such as a private well); a route of exposure (eating, drinking, breathing, or touching), and a receptor population (people potentially or actually exposed). When all five parts are present, the exposure pathway is termed a completed exposure pathway.
Tuesday, July 8, 2008
Monday, June 16, 2008
Thesis
Milestones of Thesis
Abstract 1st Semester
Purba, L. P., Tekasakul, P., Maliwan, K., 2007
ADFIEN MODELS: Efforts to Find the Better Models for RSS cooperative Smoke Aerosol Flow Simulation. (Abstract Pra-Thesis Master of Engineering in Mechanical Engineering)
Abstract Progress Report of Thesis by the end of the 1st semester
Abstract 2nd Semester
Abstract Progress Report of Thesis by the end of the 2nd semester
Abstract 3rd Semester
Abstract Progress Report of Thesis by the end of the 3nd semester
PEC-6(PSU Engineering Conference - 6 )
MENETT22, Mechanical Engeneering Networks 22th Thammasat University Thailand
Abstract 1st Semester
Purba, L. P., Tekasakul, P., Maliwan, K., 2007
ADFIEN MODELS: Efforts to Find the Better Models for RSS cooperative Smoke Aerosol Flow Simulation. (Abstract Pra-Thesis Master of Engineering in Mechanical Engineering)
Abstract Progress Report of Thesis by the end of the 1st semester
Abstract 2nd Semester
Abstract Progress Report of Thesis by the end of the 2nd semester
Abstract 3rd Semester
Abstract Progress Report of Thesis by the end of the 3nd semester
PEC-6(PSU Engineering Conference - 6 )
MENETT22, Mechanical Engeneering Networks 22th Thammasat University Thailand
Tuesday, June 3, 2008
DPM-Study
all about injection initialization?
visit: http://www.cfd-online.com/Forum/fluent_archive.cgi?read=49321
how to calculate concentration of DPM?
visit: http://www.cfd-online.com/Forum/fluent_archive_2006.cgi/read/35234
search about DPM discussion:
http://www.cfd-online.com/Search/cgi-bin/htsearch?config=htdig&exclude=&words=concentration+DPM&restrict=cfd-online.com%2FForum%2Ffluent&method=or&sort=score
visit: http://www.cfd-online.com/Forum/fluent_archive.cgi?read=49321
how to calculate concentration of DPM?
visit: http://www.cfd-online.com/Forum/fluent_archive_2006.cgi/read/35234
search about DPM discussion:
http://www.cfd-online.com/Search/cgi-bin/htsearch?config=htdig&exclude=&words=concentration+DPM&restrict=cfd-online.com%2FForum%2Ffluent&method=or&sort=score
Saturday, August 25, 2007
air-water-are-examples-of-newtonian-fluids
Fluid Mechanics defines a fluid as:
A substance which undergoes continuous deformation when subjected to a shear stress.
A fluid substance; a body whose particles move easily among themselves.
Fluid is a generic term, including liquids and gases as species.
Water, air, and steam are fluids-->Newtonian Fluid
The resistance to deformation offered by a fluid under a shear stress is called fluid viscosity. This is an important parameter to categorize the various types of fluids, or fluid models (for Fluid Mechanics calculations). The simplest fluid model is the perfect or ideal fluid. This model corresponds to a hypothetical gas or liquid that offers no resistance to shear, and thus has zero viscosity (an inviscid fluid). This model is sometimes used for real fluids with low viscosity.
Ideal Fluid (Perfect or inviscid fluid) - Hypothetical gas or liquid with zero viscosity
Newtonian Fluid - Fluid with a constant viscosity at a fixed temperature and pressure
Non-Newtonian Fluid - Viscosity is a function of shear stress
A substance which undergoes continuous deformation when subjected to a shear stress.
A fluid substance; a body whose particles move easily among themselves.
Fluid is a generic term, including liquids and gases as species.
Water, air, and steam are fluids-->Newtonian Fluid
The resistance to deformation offered by a fluid under a shear stress is called fluid viscosity. This is an important parameter to categorize the various types of fluids, or fluid models (for Fluid Mechanics calculations). The simplest fluid model is the perfect or ideal fluid. This model corresponds to a hypothetical gas or liquid that offers no resistance to shear, and thus has zero viscosity (an inviscid fluid). This model is sometimes used for real fluids with low viscosity.
Ideal Fluid (Perfect or inviscid fluid) - Hypothetical gas or liquid with zero viscosity
Newtonian Fluid - Fluid with a constant viscosity at a fixed temperature and pressure
Non-Newtonian Fluid - Viscosity is a function of shear stress
simulation-proposal-experiment
...SIMULATION GAMBIT & FLUENT...
airflow: from 8in, 1out [i have been done] --> 8in, 6out [prepare Geometry in Full scale]
particleflow: from 8in, 1out [about today, just start, by better view] --> 8in, 6out [prepare Geometry in Full scale]
...WRITING PROPOSAL [REVISED Ed.1]...
Have to write my report up to today...
...EXPERIMENTAL MEASUREMENT PREPARATION...
V, T: ready to measure
C: need to prepare
...2007.25.08...
airflow: from 8in, 1out [i have been done] --> 8in, 6out [prepare Geometry in Full scale]
particleflow: from 8in, 1out [about today, just start, by better view] --> 8in, 6out [prepare Geometry in Full scale]
...WRITING PROPOSAL [REVISED Ed.1]...
Have to write my report up to today...
...EXPERIMENTAL MEASUREMENT PREPARATION...
V, T: ready to measure
C: need to prepare
...2007.25.08...
Sunday, June 24, 2007
3ddp-solver
use 3DDP solver....
parameter u.r of momentum and pressure by default...
results:
after iteration 9 AMG Solver still serro...
according to the cfdfluent.com (discussion) says that need to use u.r one by one .... still don't have pattern or formula how to set the discretization methods....
parameter u.r of momentum and pressure by momentum=0.39 and pressure=0.31...
after iteration 4139 error AMG solver...
parameter u.r of momentum and pressure by momentum=0.39 and pressure=0.61...
after iteration 1 error AMG solver...
parameter u.r of momentum and pressure by momentum=0.61 and pressure=0.39...
after iteration 937 error AMG solver...
so try about BC's of the Simulation.....
parameter u.r of momentum and pressure by default...
results:
after iteration 9 AMG Solver still serro...
according to the cfdfluent.com (discussion) says that need to use u.r one by one .... still don't have pattern or formula how to set the discretization methods....
parameter u.r of momentum and pressure by momentum=0.39 and pressure=0.31...
after iteration 4139 error AMG solver...
parameter u.r of momentum and pressure by momentum=0.39 and pressure=0.61...
after iteration 1 error AMG solver...
parameter u.r of momentum and pressure by momentum=0.61 and pressure=0.39...
after iteration 937 error AMG solver...
so try about BC's of the Simulation.....
Saturday, June 23, 2007
equisize-skew->-0.97
Meshing success? but EquiSIZE SKEW >0.97 (11 or 16 cells)?
May have to re-fine meshing of the geometry...by:
*. coarse mesh then if need more fine mesh have to try methods below...
Because Meshing in GAMBIT automatically generated mesh (especially in 3-D) in most cases, can not provide uniformly high quality in un-structured mesh (hexahedral or tetrahedral) for complex geometry.
On the surface, the unstructured mesh does have advantages to cover large areas of complex geometry, but, in reality, a high quality mesh is always hard to obtain.
One says that need to go back to the blocking of the geometry (meshing process): to divide the geometry into smaller pieces and re-create the surface geometry so that can avoid the highly skewed cells.
**. have to try long iteration until 10^-6 criterion meet.... (already done, but still not convergence)....
have to try one by one....
And .... just an information from CFD source: it must take more time in Meshing Process and Convergence Process......
May have to re-fine meshing of the geometry...by:
*. coarse mesh then if need more fine mesh have to try methods below...
Because Meshing in GAMBIT automatically generated mesh (especially in 3-D) in most cases, can not provide uniformly high quality in un-structured mesh (hexahedral or tetrahedral) for complex geometry.
On the surface, the unstructured mesh does have advantages to cover large areas of complex geometry, but, in reality, a high quality mesh is always hard to obtain.
One says that need to go back to the blocking of the geometry (meshing process): to divide the geometry into smaller pieces and re-create the surface geometry so that can avoid the highly skewed cells.
**. have to try long iteration until 10^-6 criterion meet.... (already done, but still not convergence)....
have to try one by one....
And .... just an information from CFD source: it must take more time in Meshing Process and Convergence Process......
Subscribe to:
Posts (Atom)
