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Search took 0.00 seconds. Search: Posts Made By: anon_a
Forum: OpenFOAM Pre-Processing June 7, 2012, 00:50
Replies: 49
Views: 16,795
Posted By anon_a
-I have not used molecular dynamics in the past...

-I have not used molecular dynamics in the past (mdFoam is the name of the solver) but as far as I know, the main advantage of DSMC is to reduce the number of particles. If each particle represents a...
Forum: OpenFOAM Pre-Processing June 6, 2012, 05:26
Replies: 49
Views: 16,795
Posted By anon_a
Some comments and questions: - If you set up...

Some comments and questions:
- If you set up your DSMC case with nEquivalentParticles = 1, then what about using molecular dynamics?
- Time dependent DSMC calculations are supposed to be performed...
Forum: OpenFOAM Pre-Processing June 6, 2012, 04:43
Replies: 49
Views: 16,795
Posted By anon_a
Exactly what I meant but more clearly stated :-)

Exactly what I meant but more clearly stated :-)
Forum: OpenFOAM Pre-Processing June 6, 2012, 02:11
Replies: 49
Views: 16,795
Posted By anon_a
Hi there Check Bird's book, Appendix A,...

Hi there

Check Bird's book, Appendix A, Tables A1 and A2.
Quoting Bird, they are "reference diameters for the VHS molecular model".

The units are simply kg.
Forum: OpenFOAM Pre-Processing April 9, 2012, 17:41
Replies: 49
Views: 16,795
Posted By anon_a
I would recommend to read the manual and apply...

I would recommend to read the manual and apply the tutorials, even if they do not seem directly related with DSMC. The empty BC makes your simulation 2D. You will find this in the early chapters.

...
Forum: OpenFOAM Pre-Processing April 2, 2012, 11:27
Replies: 49
Views: 16,795
Posted By anon_a
I would do the following: (1) You need more...

I would do the following:
(1) You need more particles per cell for a better accuracy, at least 10. Thus, I would increase the particles to 5000.
(2) Your Knudsen is definitely incorrect. The number...
Forum: OpenFOAM Pre-Processing April 2, 2012, 02:12
Replies: 49
Views: 16,795
Posted By anon_a
Hello again. What I meant by "please post...

Hello again.

What I meant by "please post your case" is "could you please make a zip with your case directory and attach it here?". I will then take a look and let you know if I find something...
Forum: OpenFOAM Pre-Processing March 14, 2012, 07:41
Replies: 49
Views: 16,795
Posted By anon_a
Could you please post your case here? I am...

Could you please post your case here? I am getting very curious about what's going on and can not help you any further otherwise. The mixed boundary condition will not provide anything different...
Forum: OpenFOAM Pre-Processing March 2, 2012, 10:53
Replies: 49
Views: 16,795
Posted By anon_a
Hmmm... it seems that your field is almost not...

Hmmm... it seems that your field is almost not influenced at all by your wall (observe that only the first cell is practically warm). What is your Kn number? If it is too high, then a large...
Forum: OpenFOAM Pre-Processing March 2, 2012, 05:32
Replies: 49
Views: 16,795
Posted By anon_a
I just noticed that you had mentioned using...

I just noticed that you had mentioned using Maxwellian BCs (yes, 3 days after my post).
Sorry about that! It's a good thing noone called my bet :-)

Did you have any progress after all?
Forum: OpenFOAM Pre-Processing February 28, 2012, 13:53
Replies: 49
Views: 16,795
Posted By anon_a
How small is this affected area? can you post...

How small is this affected area? can you post some pictures?
If it is extremely small, I would bet money that you have used specular boundary conditions in constant/dsmcProperties, especially since...
Forum: OpenFOAM Pre-Processing February 27, 2012, 09:06
Replies: 49
Views: 16,795
Posted By anon_a
You are confusing boundaryT, internalT,...

You are confusing boundaryT, internalT, internalField and initial temperature.

internalField: This is an entry existing in all quantities. It is the non-boundary value of each quantity, the...
Forum: OpenFOAM Pre-Processing February 22, 2012, 09:39
Replies: 49
Views: 16,795
Posted By anon_a
First off, sorry for not checking out the...

First off, sorry for not checking out the temperature files first but I was not in my PC. Second, to be honest, I am not exactly a C++ master myself too but it is worth investing time on the code.
...
Forum: OpenFOAM Pre-Processing February 20, 2012, 12:05
Replies: 49
Views: 16,795
Posted By anon_a
A few things to get you started. The units...

A few things to get you started.

The units you wrote (kg*m^2/s^2) correspond to energy. Maybe you mixed internalT with internalE?

These temperatures are calculated in dsmcFields.C...
Forum: OpenFOAM Pre-Processing December 1, 2011, 14:02
Replies: 49
Views: 16,795
Posted By anon_a
You have to define boundaryU and boundaryT...

You have to define boundaryU and boundaryT according to the corresponding patch Maxwellian distribution properties.

The rest of them may be set to zeroGradient for all patches except...
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