[e-nikookar]

how i can change or define the material type? for example define the steel
and what is the "DT" in transportproperties file?

thank you for helping me out

[gnut1989]

Originally Posted by e-nikookar

how i can change or define the material type? for example define the steel
and what is the "DT" in transportproperties file?

thank you for helping me out

Hello Ibrahim,

You should follow the user's guide of OpenFoam. In this 2.2 section (Stress analysis of a plate with a hole), you can define the properties of materials in the constant directory (mechenicalProperties and thermalProperties files).

D and T are the length and temperature respectively in this case.

I hope that my sharing is useful to you.

Duong Tung

[Annier]

Hi Ebrahim,
1. You can define thermo-mechanical and transport properties of your material in mechanicalProperties, transportProperties and thermalProperties files located in the constant directory of the tutorial case or test example of OpenFOAM.

2. You can see the OpenFOAM programmer's guide about Dimensional Unit (Chapter 1, Section 1.5).
http://foam.sourceforge.net/docs/Gui...mmersGuide.pdf
T

dimensions       [0 0 0 1 0 0 0];

is temperature field.

and


D

dimensions      [0 1 0 0 0 0 0];

is length.

Notably, D and T are fields in OpenFOAM; and are defined within 0 directory.


3.

Originally Posted by e-nikookar

and what is the "DT" in transportproperties file?

I think, you must be talking about "DT" described in http://openfoamwiki.net/index.php/Ho...ure_to_icoFoam.
There, it is described as

DT                 DT [0 2 -1 0 0 0 0] 0.002;

The unit of DT is m^2/s (i.e.Dimensional unit of Kinematic Viscosity). It is a scalar field with a value of 0.002 m^2/s.
Also, DT (in m^2/s) may be defined as thermal diffusivity having the same dimentional units as kinematic viscosity.


4. Hence, D, T and DT are three different fields.

Yours
Anil Kunwar

[Tushar@cfd]

Originally Posted by e-nikookar

how i can change or define the material type? for example define the steel
and what is the "DT" in transportproperties file?

thank you for helping me out

Dear e-nikookar,

I guess you are doing the stressAnalysis and since you didn't mention further details of your solver so I assumed that you are using the "solidDisplacementFoam" solver for your purpose.

1.
Now if you need thermal analysis then you can switch ON the thermal stress it using "yes" in "thermalProperties" file.

thermalStress   yes;

Also, define the variables required for thermal analysis like "DT" etc. (for more information refer "readThermalProperties.H" file)

2.
If you don't need thermal analysis and want to focus on mechanical properties (like steel), I guess that is what you asked then you have to edit the "mechanicalProperties" file in your case folder. The relation for these variables can be found from the readMechanicalProperties.H and solver files.

-
Best Luck!