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Messages - mali28

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Fluent / Re: UDF for discrete phase model
« on: August 06, 2012, 05:15:03 PM »
At some point in time you will have maximum number of particles, but then particles will start to escape from the domain, at some point in simulation, a pseudo steady state will be reached. In which the number of particles at any time in the domain will be nearly constant. The number of tracked particles should not decrease at the end of simulation if your injection is continuous.

Fluent / Re: UDF for discrete phase model
« on: August 06, 2012, 03:04:42 PM »
With each discrete phase iteration, you get to see how many parcels are tracked, how many parcels are trapped and how many escape from the boundary.

I want to get time-average velocity profiles in a transient simulation. Fluent only gives me the results for a particular time step. But how can I get the time average values for a specified delta t?

Please help.


When I compile the UDF I get the following error:

Error: open_udf_library: The system cannot find the path specified

Please help.

Meshing / Re: GAMBIT - "Identifier Currently Open" Error
« on: April 10, 2012, 10:42:38 AM »
Go to your working directory and locate an .lok file with the same name as your file and delete it.
See the attached PDF file for detail.

Hello all,

Error: divergence detected in AMG solver: pressure correction---what does this mean and how do I fix the problem?

Please help me sort it out.


Fluent / Re: Coordinates of discrete phase in lagrangian approach using UDF
« on: February 02, 2012, 05:31:27 PM »
Thank you.

Fluent / What is DPM concentration in Fluent and how is it calculated?
« on: February 02, 2012, 05:30:45 PM »

I am confused about this term DPM concentration. What does it actually means because it gives very low concentration value when I plot the DPM concentration graph. What is the unit of this term can any one tell me?

Thank you in advance.

Fluent / Coordinates of discrete phase in lagrangian approach using UDF
« on: January 30, 2012, 06:19:17 PM »

Can I get x, y, z coordinates of all the particle moving in a continuous phase using UDF during the iteration. The particles are tracked using lagrangian approach.

Thank you.

Fluent / Stochastic vs Cloud tracking?
« on: January 20, 2012, 06:52:21 PM »
Can anyone tell me the difference between stochastic and cloud tracking?

Thank you.

Matlab / Re: How do I export MATLAB results to MS excel
« on: January 19, 2012, 06:02:31 PM »
When you display the results in your console, use fprintf function. For example if you have temperature (T), velocity (V) and time (t) which you want to export to excel then use the following code to display it:

fprintf('Temperature, Velcoity, Time \n');

fprintf('%8.3f, %8.3f, %8.3f \n',T, V, t);

It will display the results in the console. You can copy the results and paste it in notepad.
Save the notepad file as "name.csv"

When you open that CSV file you will see the values of Temperature, Vel. and time in three separate columns. You can copy each column in excel or use the CSV as excel. But you will not be able to save formatting in CSV so its better to copy in excel.

Fluent / Re: Fluent UDF for calculating heat loss from a composite wall
« on: January 15, 2012, 01:37:27 PM »
So I have to define it inside the DEFINE_PROFILE() macro.

I will try it. Thanks.

Fluent / Fluent UDF for calculating heat loss from a composite wall
« on: January 15, 2012, 12:08:37 PM »

I have a cylindrical geometry with fluid flowing inside. The inside surface has a layer of deposits. Then I have a metal wall. The metal wall is insulated. So I have three resistances. Fluent does not offer heat loss through a composite wall so I have to use UDF to calculate heat loss through it. I can do it by defining constant wall heat flux and using a profile defined by UDF. But I don't know much about UDF coding.

Can someone help me with this?

See below the composite wall figure attached. The geometry is cylindrical.

Thank you.

Fluent / Re: How to calculate geometry diameter using UDF
« on: January 15, 2012, 10:39:08 AM »
Thank you very much!

You solved my problem.

Fluent / How to calculate geometry diameter using UDF
« on: January 14, 2012, 09:58:01 PM »

I have a geometry with varying diameter along the column height. I want to specify heat loss condition because the wall is insulated. For that, I need to calculate the overall heat transfer coefficient first. For that I need the inside diameter of the column as well. Since the diameter is not constant throughout the geometry, I have to find a way of calculating the distance from the centre of geometry up to the wall using UDF.

Any help will be highly appreciated.

Thank you.

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