Using the TUI to write/read profiles to update BC's?

bloodflow · August 21, 2019, 11:18

For a cylinder of fluid with 2 phase flow, your inlet requires a VOF BC so lets put say 0.5 as an initial guess, which is applied uniformly to the inlet. In reality, this distribution may be different depending on their densities and visocisties. If you export the VOF at the outlet as a profile, and read it as the inlet VOF BC you now have a slightly better condition. If you repeat this several times you could generate a better approximation of the inlet VOF (Providing you have a cyclic velocity BC).

So far I am exporting the outlet VOF at the end of my solution using TUI, but then loading it as the inlet BC manually, and solving again using TUI and so on. Can I do this using the TUI entirely?

Some example;

PHP Code:


			
rc VOFProfile.cas
/solve/initialize/hyb-initialization
/solve/set/time-step 0.001
/solve/dti 800 75
/file/write-profile/ VOF-BC-1 outlet () highdensity-vof ()
exit
yes

Is my current TUI which export the VOF profile at the outlet. Within the same run can read this profile and apply it to my inlet? (I imagine the code would look something like this)

PHP Code:


			
rc VOFProfile.cas
/solve/initialize/hyb-initialization
/solve/set/time-step 0.001
/solve/dti 800 75
/file/write-profile/ VOF-BC-1 outlet () highdensity-vof ()
/file/read-profile/ VOF-BC-1
/define/boundary-conditions/velocity-inlet/multiphase/ VOF-BC-1 ()
/solve/dti 800 75
/file/write-profile/ VOF-BC-2 outlet () highdensity-vof ()
/file/read-profile/ VOF-BC-2
/define/boundary-conditions/velocity-inlet/multiphase/ VOF-BC-2 ()
......

Is this possible?

AlexanderZ · August 22, 2019, 00:54

you code is here, why is it impossible?
run it

In fluent GUI you can use calculation activities -> execute commands:
read journal file each 800 time steps

so you dont need to hardcopy each write/read iteration

Check, may be periodic boundary condition is suitable for you

best regards

bloodflow · August 22, 2019, 08:51

rc profile.cas
/solve/initialize/hyb-initialization
/solve/set/time-step 0.008
/solve/dti 100 30
/file/write-profile/ VOF-1 outlet () rbc-vof ()
/file/read-profile/ VOF-1
/define/boundary-conditions/velocity-inlet inlet rbc no no yes yes yes yes udf "CoronaryVelocityWaveform::libudf" yes no outlet rbc-vof
/solve/dti 100 30

Is the code I ended up using or with a better explanantion:

/define/boundary-conditions/velocity-inlet "name of inlet" "name of 2ndary phase" no no "yes normal to boundary" "Yes to setting up velocity udf at inlet" "name of UDF compiled" "yes to profile for multiphase" "no to UDF for multiphase" "origin of profile" "variable name"

August 21, 2019, 11:18	Using the TUI to write/read profiles to update BC's?	#1
bloodflow Member Sebi Join Date: Mar 2019 Posts: 49 Rep Power: 7	For a cylinder of fluid with 2 phase flow, your inlet requires a VOF BC so lets put say 0.5 as an initial guess, which is applied uniformly to the inlet. In reality, this distribution may be different depending on their densities and visocisties. If you export the VOF at the outlet as a profile, and read it as the inlet VOF BC you now have a slightly better condition. If you repeat this several times you could generate a better approximation of the inlet VOF (Providing you have a cyclic velocity BC). So far I am exporting the outlet VOF at the end of my solution using TUI, but then loading it as the inlet BC manually, and solving again using TUI and so on. Can I do this using the TUI entirely? Some example; PHP Code: `rc VOFProfile.cas /solve/initialize/hyb-initialization /solve/set/time-step 0.001 /solve/dti 800 75 /file/write-profile/ VOF-BC-1 outlet () highdensity-vof () exit yes` Is my current TUI which export the VOF profile at the outlet. Within the same run can read this profile and apply it to my inlet? (I imagine the code would look something like this) PHP Code: `rc VOFProfile.cas /solve/initialize/hyb-initialization /solve/set/time-step 0.001 /solve/dti 800 75 /file/write-profile/ VOF-BC-1 outlet () highdensity-vof () /file/read-profile/ VOF-BC-1 /define/boundary-conditions/velocity-inlet/multiphase/ VOF-BC-1 () /solve/dti 800 75 /file/write-profile/ VOF-BC-2 outlet () highdensity-vof () /file/read-profile/ VOF-BC-2 /define/boundary-conditions/velocity-inlet/multiphase/ VOF-BC-2 () ......` Is this possible?

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August 22, 2019, 00:54		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	you code is here, why is it impossible? run it In fluent GUI you can use calculation activities -> execute commands: read journal file each 800 time steps so you dont need to hardcopy each write/read iteration Check, may be periodic boundary condition is suitable for you best regards

August 22, 2019, 08:51		#3
bloodflow Member Sebi Join Date: Mar 2019 Posts: 49 Rep Power: 7	rc profile.cas /solve/initialize/hyb-initialization /solve/set/time-step 0.008 /solve/dti 100 30 /file/write-profile/ VOF-1 outlet () rbc-vof () /file/read-profile/ VOF-1 /define/boundary-conditions/velocity-inlet inlet rbc no no yes yes yes yes udf "CoronaryVelocityWaveform::libudf" yes no outlet rbc-vof /solve/dti 100 30 Is the code I ended up using or with a better explanantion: /define/boundary-conditions/velocity-inlet "name of inlet" "name of 2ndary phase" no no "yes normal to boundary" "Yes to setting up velocity udf at inlet" "name of UDF compiled" "yes to profile for multiphase" "no to UDF for multiphase" "origin of profile" "variable name"