Using MHD addon-module
 

Dear all users,

I want to apply Lorentz force in simulation of weld pool in arc welding and now we want to know is MHD module good way to simulate lorentz force in weld pool??

Thanks and best regards.

Re: Using MHD addon-module
 

Can you help me to find MHD addon-module? I want to simulate natural convection in a annulus and calculate the respective magnetic field generated from this motion of fluid. I dont have MHD module but I want to isntall it. How can I do this??

Thank you.

Re: Using MHD addon-module
 

Dear my friend,

You must read a case in your fluent and then in text commond that is show ">" symbol and you must type "define" and then you must type "models" then type "addon-module" after typing this phrase a list of addon modules appears and you must type "1" and then enter and after that the MHD module will active.

Re: Using MHD addon-module
 

Dear Alireza, I want to thank you for your response.

Dear Alireza,

Did you already finished your project regarding weld pool in arc welding?

Hi
 

Hi

When the list appears and i type 1 this error appear
/define/models> 1
invalid command [1]
:confused:

First load the case and then try to use this command (same as above):
define ---> models--->addon-module
Now you will get the list of five models:
0. none
1. MHD Model
2. Fiber Model
3. Fuel Cell and Electrolysis Model
4. SOFC Model with Unresolved Electrolyte
5. Population Balance Model
Enter Module Number: [1]

See Chapter 4 page 4-1 and 4-2 of this guide:
https://www.sharcnet.ca/Software/Flu.../mhd/flmhd.pdf

I don't know why It doesn't appear for me:(
Instead of that this is appeared
acoustics/ energy? steady?
addon-module multiphase/ unsteady-1st-order?
axisymmetric? radiation/ unsteady-2nd-order?
crevice-model? solidification-melting? viscous/
dpm/ solver/
dynamic-mesh? species/

You are looking at GUI !!! Use text command...

http://imageshack.us/a/img651/1024/34861101.png

http://imageshack.us/a/img526/618/16723022.png

http://imageshack.us/a/img41/4912/56688790.png

Hi
 

I don't have the addon-modules in difine models!!!

what is the problem?

you have to type command then you will get the list. can you show the pics of fluent screen?

addon-models
 

Yes..here you are
the problem is when I type "addon-models"


/define/models> addon-models
invalid command [addon-models]

use command addon-module and you are using addon-models. This is wrong

yesssssssssss..........!

Thank you very much my friend
!

MHD Module
 

Hi people!

This is my first time in CFD Online! I hope everything is fine with you!

Well, I have a problem and I need your help to solve it.

Despite I'm quite new in working with Fluent, a colleague ask me to simulate the flow of particles with magnetic properties in a tube with circular section that has the shape of an arc.

However, the particles are subjected to a magnetic field in a specific area.

I have to simulate this case and study the influence in the pathlines of the particles.

What is the best method that you suggest? I was trying to use a MHD-DPM interaction but I can't define the magnetic properties of the particles.

Can you help me please?

Thank you in advance!

Best regards,

FCS

Hi

In Mhd Panel you are able to apply a radial Magnetic field to fluid
If you had any question feel free

Good luck:)

Payam89, thank you for your answer. Can you please try to help me with my application?

Well, I continue with some problems using MHD module.

I built an arc-tube and near the wall, I've also built a box that I want it to be my magnet, generator of the magnetic field.

I have a group of particles (DPM) flowing in water (approximate density) and I have defined a specific magnetic permeability to them (1.5e-06). Then, I have applied the Magnetic Field to the magnet; I defined the boundary conditions: thin wall of glass to the tube wall and insulating wall to the magnet wall).

Then I initialize de DPM and the MHD, and I run just one more iteration (my flow is converged) to assume the properties of the magnetic field.

The problem is when I try to observe the changes in Particle Tracks, nothing changes between before and after the MHD application.

Do you know what am I doing wrong?

(The magnetic permeability used for the water is very close to the one of the particles)

Thank you in advance,

FCS

First of all enhance the permeability of the particle to make sure that it's not because of permeability.

then you have to do the mhd setting at the end of the all setting in you modelI mean exactly beforethe iterration

could you email me to have a closer contact...I have a question of you project

good luck

Mhd
 

Hi dear

What is difference in B0 in Magnetic induction and B0 in Electrical Potential Exactly !

Thanks in advance

error
 

Hi Ali
when I try to load addon-module this error apperas:
Invalid command [addon-module]

how can I do now?

It could be that you don't have the additional license required, but the command prompt list should be:

define > models > addon-module > select option for MHD

Cheers
Stuart

You are getting that error, because you have to load a mesh before typing in the commands to load the MHD module.

Hope this helps,

hey i'm trying to activate this module as well. i type in the command properly but it says "invalid command [addon-module]"

when i type "help" and press enter it shows me the options and says that addon-module is disabled. see:

for me fluent says "invalid command [addon-module] and when i type "help" it says that that addon-module is disabled.

what can i do now?

You will FIRST have to load a mesh to the Fluent, then go to enable the MHD add-on. This feature is not enabled when the mesh is not loaded in Fluent. I have tested this.

and how do i enable meshing? when i fire up fluent 16 i check mark the option for "meshing mode". is that correct?

if it is, i did that and when i type the command it still doesn't allow. it says "invalid command [define].

this is frustrating. need to get a flow sim done

No, it is not Mesh Mode. Just Start the Fluent normally (with double precision) and then click: File - Read - Mesh. Then load a mesh and once that has finished, Enter the commands.

hi i have same problem i typed as define/models/addon-module
but it says invalid command can you help me?

Hi erfan1995,

Can you post the Text User Interface commands? Full list with the error.

Regards,
Dean

aha i had same problem but i solved it!
you should put your cursor at the end of texts in console and then press enter button once to go to next line and you will see
">"
now type this:
define/models/addon-module

you will get the point!

hi dean993 i already found the right way thank you so much!

hello,


can you please tell me how you load the mhd module, i have fluent 19, and i read that i need to do a text command, i don't know how, i can do udfs and pretty much everything, but the text command is something i'vre never used


thanks

Hi Vektor,

Load Fluent with a mesh or case file. Put your cursor on the console window and hit enter. You will get a set of text. Then paste "define/models/addon-module" and hit enter. Then you will get a set of addon modules. Type "1" and hit enter to activate the model. Go to the Models tree where you will find the MHD model visible.

Hello,
yup, it did work, thank you so much for the tip.

you should write in console define/models/addon-module
then press enter
then press 1
it will appear in models now

ansys mhd problem
 

hello sir, i am also stuck in the same problem. i tried using your technique mentioned here, but still there was no effect of magnetic field. can there be any other problem? Also, what type of wall should i use, conducting or thin?

First type "define" (without inverted commas)
Then type "models"
Then type "addon-module"

A list will appear like this:
0. None
1. MHD Model
2. Fiber Model
3. Fuel Cell and Electrolysis Model
4. SOFC Model with Unresolved Electrolyte
5. Population Balance Model
6. Adjoint Solver
7. Single-Potential Battery Model
8. Dual-Potential MSMD Battery Model
9. PEM Fuel Cell Model
10. Macroscopic Particle Model
11. Reduced Order Model
Enter Module Number: [0]

Type 1 on text interface and you will be able to activate MHD model.

Unload addon module
 

I want to use another addon module, may I know how to remove the previous module? I have load module 3 and now want to load module 4. Thank you!