Plasma Module - Latest Discussions - COMSOL Forums

Can we extended Dielectric Barrier Discharge(DBD) from 1D to 2D?

Fri, 04 May 2012 10:57:33 +0000

Hello! everyone.

Well, I see the COMSOL document (Multiphysics 4.1) about the dielectric barrier discharge (DBD) model however, it is 1D simulation.
Can we extended Dielectric Barrier Discharge(DBD) model from 1D to 2D simulation?

Thank you.

ICP. Capacitive coupling between coil and plasma

Thu, 03 May 2012 05:31:15 +0000

Hello!

I would like to simulate Inductively Coupled Plasma source.
One of the well-known features of such plasma sources is that in particular operating conditions power is transferred to the plasma mainly through capacitive coupling.

Does anyone can clarifiy if COMSOL ICP module takes capacitive coupling into account?

If not, is there a way how to handle with this problem?

Thanks!

Capacetively Coupled Plasma

Wed, 25 Apr 2012 15:36:53 +0000

Hi,

where can I find COMPLETE SET of CCP model equations?

thanx

Failure to solve Thermal Plasma Tutorial

Wed, 25 Apr 2012 13:13:46 +0000

After following the Thermal Plasma Model Tutorial (http://www.comsol.com/showroom/documentation/model/8658/), I attempted to solve my generated model but I receive the following error:

Failed to find consistent initial values.
Last time step is not converged.
-Feature: Time-Dependent Solver 1 (sol1/t1)
-Error: Failed to find consistent initial values.

I believe this is related to the Electron Mobility Value in the Electron Density and Energy Tab of the Plasma Model 1 feature in the Inductively Coupled Plasma Physics in the Model Builder Window.

The value for mu_e of 4E24/icp.Nn shows up in orange with the warning:

Deduced unit is [m^3], expected is [m^2/(V*s)]

I have tried running the completed model from the comsol site with the same result.

Has anyone experienced this error?

gmaw information

Sat, 07 Apr 2012 07:35:20 +0000

hello,

i am looking for information on modeling a free burning arc... anyone could help me out with that?

best regards,

rainer

Error message on dc discharge

Tue, 27 Mar 2012 07:35:12 +0000

Dear Sir,

I was trying to do the numerical modeling on DBD argon .While computing it gives the error message
Recoverable error in residual, but solver could not recover.
Time : 2.818939605857036e-005
Last time step is not converged.

Could anybody suggest me how it cam be solved

Failed to create matching edge discretizations.

Thu, 22 Mar 2012 09:21:21 +0000

Hello,
I am new to COMSOL and still building my first model which is nothing but a tutorial available on the website.It is DC Glow discharge in Plasma module. But after doing all the things when I am building the mesh it is showing "Failed to create matching edge discretizations." for one particular domain. I am unable to identify the problem as it is related to mesh properties. I am attaching a screen shoot of the window and model file also.

how to remove some of "Property" from "Material Contents" ?

Fri, 16 Mar 2012 17:52:52 +0000

Hello!
The essence of the problem is that when a solve similar models, appear different Property at Material Contents.
Some of the Property in the Material Contents Waste but I can not remove them!
How to remove some of "Property" from "Material Contents" ?
attached the photos
Thanks

The lowest pressure for modeling inductive coupled plasma?

Tue, 13 Mar 2012 10:39:21 +0000

Hi,

What is the lowest pressure that COMSOL can calculate for modeling inductive coupled plasma?

I modeled the process by pressure 0.001 [atm] and everything works fine, but when I want to simulate at very low pressure (vacuum), " 1e-4 ~ 1e-8 [atm] ", I get an error message:
"Failed to find consistent initial values.
Last time step is not converged."

I will be grateful if you explained to where is a problem!

Thank you

lowest pressure (vacuum)

Sun, 11 Mar 2012 21:19:42 +0000

Hi,

what is the lowest pressure for the simulation in Inductive coupled plasma?

I modeled the process by pressure 0.001 [atm] and everything works fine, but when I want to simulate at very low pressure (vacuum), 1e-8 [atm], I get an error message:
"Failed to find consistent initial values.
Last time step is not converged."

I will be grateful if you explained to where is a problem!

Thank you

open boundary

Wed, 07 Mar 2012 07:28:34 +0000

Hi,
I am trying to model evacuation of air between two plates which means i shud have the right and left boundaries open to atmosphere. The air is evacuated using a narrow outlet at the centre of the bottom plate.

I noticed something called 'open boundary' in the laminar flow physics. does this help in creating the right and left boundaries open to the atmosphere?
Or does anyone have a suggestion to make the right and left boundaries open to atmosphere?
Please help

Thanks in advance.

The inlet condition in the plasma module

Thu, 01 Mar 2012 08:54:31 +0000

Dear all,

I am using the DC plasma module to model a certain discharge. I recently wanted to use the inlet condition in one of my simulations. But the problem is that I always get 'Inconsistent Initial values'. For testing I tried a lot of initial values but none of them have worked. I even made very simple simulations just for testing, it didn't work either.

I am wondering if anyone else is having the same problem I am having, does any one have a such problem??

Awaiting your kind response,
Sincerely,
M. Saadeh

Photocathode emission

Wed, 22 Feb 2012 00:19:57 +0000

I would like to create a simulation model that will simulate the photoelectric effect. Ideally there will be a light source, from 300 nm-22 um wavelength which will then hit an emitter. This emitter will be comprised on 3-4 different compounds all which will act like a catalyst that will convert the photon to free electrons. I have been looking through COMSOL and online to see if it is capable, right now I don't think that it can. Could someone let me know if this is possible and a good way to get started.

Thanks

Eric

Inductive Coupled plasma!

Tue, 21 Feb 2012 18:01:21 +0000

Hello!
I have a problem in the modeling of the source of plasma (high-frequency ionization).
Like I did everything correctly but still no results and gives an error message.
I tried many times and different options but useless.
Please help me solve this problem.
I have attached the files.
thanks a lot!

sputtering simulation(hot topic)

Mon, 13 Feb 2012 05:53:04 +0000

had anyone done a simulation on sputtering?...mainly the magnetron sputtering?....any idea how do i start?....thanks

Wrong number of dofs in initial value.

Sun, 08 Jan 2012 17:06:48 +0000

I have new model and new error:

Pleasse help me:

Time depndent study:

Wrong number of dofs in initial value.

Whot is it dofs ?

Thank.

Plasma arc

Thu, 22 Dec 2011 21:13:38 +0000

Hi,

I'm trying to simulate a plasma arc speaker (a sound generator based on the vibration of a ionized arc). I have setup a CCP module (I hope correctly... is the first time I use this physics), but now I don't know how I can read the result (how to understand if with the applied voltage the arc is generated and how it moves in time)

Anyone have experiencies of similar problem?

Thanks!!

surface charge accumulation

Thu, 15 Dec 2011 09:47:47 +0000

Dear all!

I just took a chance on combining electrostatic and transport of charged diluted species. Now I want to account for any accumulated surface charges due to diffusion of the charged species to the non conducting walls.

I tested with “Surface Charge Density” and with “External Surface Charge Accumulation” boundary conditions in conjunction with the concentration c on “No Flux” and “Outflow” boundary. Anyway the results are from my point of view are not reasonable, mostly because I’m expecting the surface charge only to rise up. But with any combination there are also conditions were the once accumulated surface charges experiencing also decay.

Any hints what combination of boundary condition my work out?

Thanks for your suggestions!

Bert

Dielectric B.C. in Plasma Module

Tue, 30 Aug 2011 19:35:03 +0000

Hello All,

I am trying to adapt the 2D argon_gec_icp file to have a dielectric boundary at the walls of the plasma domain. For this purpose I would like to use Surface Charge Accumulation as an Electrostatic boundary condition, but all boundaries appear as "not applicable". Does anyone know the reason for this? Better yet, does anyone have a suggestion for implementing the dielectric boundary condition properly?

Thank you,
Sonya

Is possible to simulated the arc discharge temperature?

Mon, 13 Jun 2011 19:39:02 +0000

Hi! I want to know if there is possible to simulate an arc discharge on air? I'm interested only in the temperature generated.Thanks