Use DEFINE_ADJUST change boundary condition

TDi · December 11, 2010, 09:49

Click on my name to the left to send a private message. I do not wish to give out my email address. Thanks.

darren_camilleri · November 29, 2011, 07:01

Hi people,

I was attempting the 3D adiabatic compression tutorial with dynamic meshing and I haven't got the file cyl3d_new.msh. If anyone can send me the file please it will be greatly appreciated. Thanks.

My email: darren.camilleri90@gmail.com

quiyoom · March 1, 2013, 06:19

Hi, I am trying to simulate the 3-D flow dynamics of bubble column (gas-liquid flow using euler-lagrange simulation) using FLUENT. I am filling only half the column with water and trying rest to patch with air.
Could anyone suggest the right way to patch gas-liquid in the bubble column? Also, how do you really model gas-liquid free surface flow in Bubble Column? Thanks.

I appreciate your help.

Quiyoom

jyothsna k · June 21, 2014, 04:48

My problem is similar to the one discussed here. I need to specify the flux of scalars at the boundary. They are neither constant nor are they known before hand.
I followed the procedure suggested by you. I use the define_profile to initialise the flux value to zero and write the zone id and uds id to a file. This is happening.
I then access the corresponding files depending on the thread id, read the values from the files and use F_PROFILE to assign the flux values from stored memory.
I have used solve/set/expert to save the gradients.
When i hook the ADJUST udf and run, fluent shuts down.
What could be the problem?
Thanks in advance

TDi · August 1, 2014, 11:28

Hi, and thanks for the interest in this thread. I should let you know that I am not an active Fluent user anymore (for 3 years now) and will not be able to respond to further inquiry at present.

sina_sls · August 3, 2022, 08:17

Quote:

Originally Posted by liurengtong123

Hi
thank you for giving me some suggestion.
I want to talk about my problem in detail ,so please give me your Email in order to discuss about it.
My Email :liurengtong@163.com
Thanks very much!!!

Hello,

I want to change UDS boundary value i mean i want to use transient value , you know how can i do this with Define Adjust?

Regards,

Xuxu · October 4, 2023, 09:46

Quote:

Originally Posted by sina_sls

Hello,

I want to change UDS boundary value i mean i want to use transient value , you know how can i do this with Define Adjust?

Regards,

Hello,
do you get any information on your problems? My problem is the same as you. Thank you in advanced!

AlexanderZ · October 5, 2023, 04:23

use DEFINE_PROFILE macro

Xuxu · October 5, 2023, 07:54

Quote:

Originally Posted by AlexanderZ

use DEFINE_PROFILE macro

Hello,Alexander
I need to apply the gradient of C_UDSI on the surface, does DEFINE_PROFILE work? I find that the GUI have two options, which is Flux and Value for UDS boundary condition.

Bdew8556 · January 14, 2024, 01:56

Hey guys,

I'm working on something similar, was wondering if maybe you solved yours.

I've got a simple flow problem with:
INLET = Pressure
OUTLET = mass flow rate

at some location I've got a user surface where I can calculate flow velocity.
I want a UDF that can update the mass flow rate at the outlet based on the velocity calculated at the user surface.

Any thoughts? do I need to use the DEFINE_ADJUST macro?

November 29, 2011, 07:01	3D dynamic mesh tutorial	#22
darren_camilleri New Member Darren Cam Join Date: Nov 2011 Posts: 8 Rep Power: 15	Hi people, I was attempting the 3D adiabatic compression tutorial with dynamic meshing and I haven't got the file cyl3d_new.msh. If anyone can send me the file please it will be greatly appreciated. Thanks. My email: darren.camilleri90@gmail.com

August 1, 2014, 11:28	Not using Fluent these days	#25
TDi Member Tim Diller Join Date: Mar 2010 Location: Austin, TX Posts: 32 Rep Power: 16	Hi, and thanks for the interest in this thread. I should let you know that I am not an active Fluent user anymore (for 3 years now) and will not be able to respond to further inquiry at present.

October 5, 2023, 04:23		#28
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	use DEFINE_PROFILE macro __________________ best regards ****************************** press LIKE if this message was helpful

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December 11, 2010, 09:49		#21
TDi Member Tim Diller Join Date: Mar 2010 Location: Austin, TX Posts: 32 Rep Power: 16	Click on my name to the left to send a private message. I do not wish to give out my email address. Thanks.

March 1, 2013, 06:19		#23
quiyoom New Member abdul quiyoom Join Date: Apr 2012 Posts: 2 Rep Power: 0	Hi, I am trying to simulate the 3-D flow dynamics of bubble column (gas-liquid flow using euler-lagrange simulation) using FLUENT. I am filling only half the column with water and trying rest to patch with air. Could anyone suggest the right way to patch gas-liquid in the bubble column? Also, how do you really model gas-liquid free surface flow in Bubble Column? Thanks. I appreciate your help. Quiyoom

June 21, 2014, 04:48		#24
jyothsna k New Member jyothsna k Join Date: May 2014 Posts: 18 Rep Power: 12	My problem is similar to the one discussed here. I need to specify the flux of scalars at the boundary. They are neither constant nor are they known before hand. I followed the procedure suggested by you. I use the define_profile to initialise the flux value to zero and write the zone id and uds id to a file. This is happening. I then access the corresponding files depending on the thread id, read the values from the files and use F_PROFILE to assign the flux values from stored memory. I have used solve/set/expert to save the gradients. When i hook the ADJUST udf and run, fluent shuts down. What could be the problem? Thanks in advance

January 14, 2024, 01:56		#30
Bdew8556 Senior Member Brett Join Date: May 2013 Posts: 216 Rep Power: 14	Hey guys, I'm working on something similar, was wondering if maybe you solved yours. I've got a simple flow problem with: INLET = Pressure OUTLET = mass flow rate at some location I've got a user surface where I can calculate flow velocity. I want a UDF that can update the mass flow rate at the outlet based on the velocity calculated at the user surface. Any thoughts? do I need to use the DEFINE_ADJUST macro?