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Search took 0.00 seconds. Search: Posts Made By: Daniel_Khazaei
Forum: ANSYS July 20, 2014, 19:52
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
Hello again I have tried to find the optimal...

Hello again

I have tried to find the optimal scale factor for my case, starting with unstable solution while slowly increasing the scale factor.

I have set 2 different result trackers in...
Forum: ANSYS July 16, 2014, 07:06
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
As you suggested, very low under relaxation was...

As you suggested, very low under relaxation was needed to get convergence. Hence, I have decided to use stabilization in dynamic mesh setup on system coupling zone.

With the following setting, I...
Forum: ANSYS July 11, 2014, 20:18
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
Would you please clarify a few things for me: ...

Would you please clarify a few things for me:

1) How many coupling iteration is normal in tightly coupled simulation?

I have read that I should keep number of coupling iteration below 10!...
Forum: ANSYS July 10, 2014, 16:40
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
"Can you assume the min pressure of 10964.52 Pa...

"Can you assume the min pressure of 10964.52 Pa is consistent with the MRI scan geometry?"

You mean that the MRI image based geometry has its current shape (initial) due to the min pressure of...
Forum: ANSYS July 9, 2014, 19:27
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
"You can change to local scaling to get a better...

"You can change to local scaling to get a better residual normalization"

Velocity residuals are normal, it is only the continuity. Nevertheless, residual reporting is now OK with your suggestion...
Forum: ANSYS July 8, 2014, 17:05
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
"To check if Fluent is initialized correct you...

"To check if Fluent is initialized correct you can scroll up the Fluent transcript file and look for some output that says Fluent is reading the dat file. If you don't see this, then something went...
Forum: ANSYS July 7, 2014, 16:23
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
Thank you very much for the detailed explanation...

Thank you very much for the detailed explanation man. ;)

I have calculated the mean blood pressure based on my transient profile which is 13,784 Pa.
At the start of simulation (based on the...
Forum: ANSYS July 4, 2014, 16:57
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
A few questions about setting operating...

A few questions about setting operating condition, actually I am explaining the approach I am thinking about. (correct me if I am wrong):

1) Changing the operating pressure to the mean blood...
Forum: ANSYS July 4, 2014, 15:02
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
It is a Common Carotid Artery geometry obtained...

It is a Common Carotid Artery geometry obtained from the MRI images. I am working with a medical organization and they have provided the STL file for me from one of their patients. So it is an...
Forum: ANSYS July 4, 2014, 09:37
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
I will try to test that. As you can see, I...

I will try to test that.

As you can see, I have a vessel to model.
I have a velocity profile at the inlet and two pressure profile for each outlets.

Pressure force at the beginning of the...
Forum: ANSYS July 3, 2014, 17:43
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
Thanks for your help. When I use...

Thanks for your help.

When I use steady-state with pseudo transient and Time scale factor 1 every thing is fine.
In the new version, ANSYS 15, pseudo transient method can only be activated if I...
Forum: ANSYS July 3, 2014, 11:03
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
Thank you very much for the help. Only one...

Thank you very much for the help.

Only one question, what does this step mean:

- Set the Time Step Size in System Coupling as if you were solving a pseudo-transient steady-state case

does it...
Forum: ANSYS July 2, 2014, 09:46
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
Hello Here is my email address: ...

Hello

Here is my email address:

shadowfax2011@gmail.com

Did you have any success in your method of initializing the transient solution?
I have tried that but it seems that there is no...
Forum: ANSYS July 1, 2014, 08:01
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
Hello Sir, Thanks for your help. ...

Hello Sir,

Thanks for your help.
Inconsistent unit system in FE Modeler was the cause.
Global unit system was correct, however unit system of FE Modeler was set to mm.

----------

I have...
Forum: ANSYS June 30, 2014, 11:43
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
I will check it and comeback. Have you ever...

I will check it and comeback.

Have you ever used only mesh files (fluid and solid) to setup a FSI simulation?

"What do you mean by "presence of geometry"?" : I didn't load any geometries only...
Forum: ANSYS June 30, 2014, 11:32
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
I have tried to do that, however solid mesh is...

I have tried to do that, however solid mesh is not shown in the CFD-post.

Does Ansys FSI simulation require the presence of geometry?
Have you ever used only mesh files (fluid and solid) to setup...
Forum: ANSYS June 30, 2014, 10:02
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
any help? Best wishes ;)

any help?


Best wishes ;)
Forum: ANSYS June 18, 2014, 06:45
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
Thank you. I will try to test your suggestion. ...

Thank you. I will try to test your suggestion.
However I did not understand the second part of your suggestion regarding deleting the *.ds file from ansys. :rolleyes:

Thanks in advance.
...
Forum: ANSYS June 14, 2014, 06:18
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
I think I have found the problem, however I don't...

I think I have found the problem, however I don't have any alternatives. You can see the project schematic in the att. I have tried with much simpler problem which I have tested with the same method...
Forum: ANSYS June 4, 2014, 11:55
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
Yes, I am planning to perform a fluid-structure...

Yes, I am planning to perform a fluid-structure interaction in a vessel.

1) fluid mesh is generated in ICEM (att, fluid)

2) surface mesh which is the same on both sides (fluid & solid). (att,...
Forum: ANSYS June 4, 2014, 05:47
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
I have another problem regarding mapping summery...

I have another problem regarding mapping summery in system coupling log file.
It reports 0 percent mapped on both sides of FSI interface.

I have generated the fluid mesh in ICEM, then I have...
Forum: ANSYS June 3, 2014, 02:01
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
Thank you. Yes I have tried that method and...

Thank you.

Yes I have tried that method and system coupling does not allow transient mechanical with stead-state Fluent.

----

Your new suggestion seems reasonable, I will try it soon. ;)

...
Forum: ANSYS May 29, 2014, 06:49
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
Sorry for the late response. I was too busy with...

Sorry for the late response. I was too busy with rest of my works.

Do you need the flutter to move based on the prescribed motion?

---------

Regarding my question, what I understand is:
...
Forum: ANSYS May 13, 2014, 09:41
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
Yes it's a two-way fsi simulation. Regarding...

Yes it's a two-way fsi simulation.
Regarding the deformation:

1) prescribed motion of wing like plunging and pitching: you need to write a UDF

2) deformation of wing due to aerodynamic forces...
Forum: ANSYS May 12, 2014, 17:24
Replies: 50
Views: 18,406
Posted By Daniel_Khazaei
Do you need a prescribed motion for the wing?

Do you need a prescribed motion for the wing?
Showing results 1 to 25 of 28
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