Hi,

Guest

F

Factoo,Anjum

Fri, Sep 20, 2024 6:14 AM

Hello Everyone,

I am currently working on a problem where I need to capture the liquid sloshing effect inside a transportation cylindrical vessel and then map the pressure vs time load into structural environment.

Since liquid sloshing is a dynamic phenomenon. Ideally, I should have acceleration vs time data, so that we can apply it in our CFD environment and get pressure vs time load.

But currently, the site people don't have any acc. Vs time data. The only thing they know is that maximum site velocity (20kmph). Now, I need to concoct some acceleration vs time data.

Basic assumptions: The vessel is mounted on the trolley and will be used inside the facility under controlled conditions. The Max. speed limit at the site is 20kmph. The roads are paved.

Since I was not sure where to start. I used basic equation of motions to calculate acceleration.

Linear deceleration case (20kmph to 0kmph)

- I have assumed dt (change in time) as 0.1 sec, 0.25 sec, 0.5 sec, 0.75 sec & 1.0 sec, where 0.1 sec (dt) representing Hard Braking and 1.0 sec (dt) representing Normal Braking.

Cornering case

- Generate acceleration values for cornering (transverse direction) was more complex (lot of parameters to consider- turning radius, speed etc), therefore I assumed 0.5g,0.4g, 0.3g, 0.2g & 0.1g.

Question to be answered !

Please recommend if the time assumption taken to calculate linear acceleration is reasonable. If not, what will be your advice.

Best Regards

Anjum Riaz

Hello Everyone,
I am currently working on a problem where I need to capture the liquid sloshing effect inside a transportation cylindrical vessel and then map the pressure vs time load into structural environment.
Since liquid sloshing is a dynamic phenomenon. Ideally, I should have acceleration vs time data, so that we can apply it in our CFD environment and get pressure vs time load.
But currently, the site people don't have any acc. Vs time data. The only thing they know is that maximum site velocity (20kmph). Now, I need to concoct some acceleration vs time data.
Basic assumptions: The vessel is mounted on the trolley and will be used inside the facility under controlled conditions. The Max. speed limit at the site is 20kmph. The roads are paved.
Since I was not sure where to start. I used basic equation of motions to calculate acceleration.
Linear deceleration case (20kmph to 0kmph)
* I have assumed dt (change in time) as 0.1 sec, 0.25 sec, 0.5 sec, 0.75 sec & 1.0 sec, where 0.1 sec (dt) representing Hard Braking and 1.0 sec (dt) representing Normal Braking.
Cornering case
* Generate acceleration values for cornering (transverse direction) was more complex (lot of parameters to consider- turning radius, speed etc), therefore I assumed 0.5g,0.4g, 0.3g, 0.2g & 0.1g.
Question to be answered !
Please recommend if the time assumption taken to calculate linear acceleration is reasonable. If not, what will be your advice.
Best Regards
Anjum Riaz

F

Factoo,Anjum

Fri, Sep 20, 2024 8:53 AM

Hello Team,

Follow-up Info: Here are the 5 load cases that I have prepared.

Load case1: [dt =0.10 sec] [linear acc. = 55.6 m/s2] [transverse acc.= 0.5g]

Load case2: [dt =0.25 sec] [linear acc. = 22.2 m/s2] [transverse acc.= 0.4g]

Load case3: [dt =0.50 sec] [linear acc. = 11.1 m/s2] [transverse acc.= 0.3g]

Load case4: [dt =0.75 sec] [linear acc. = 7.41 m/s2] [transverse acc.= 0.2g]

Load case5: [dt =1.00 sec] [linear acc. = 5.56 m/s2] [transverse acc.= 0.1g]

Each load cases will be solved, just to capture the spectrum of loads. Since I don't have any site data.

Each load case will be transient in nature. Example Load case 1: Vessel with liquid will be accelerated for a period 0 to 0.1 sec with an acceleration of 55.6 m/s2 , after 0.1 sec the acceleration will be zero and the liquid sloshing will continue till the liquid velocity is zero (vel. is monitored). The results will be saved at each 0.1 sec. and then results from Fluent are transferred to transient structural to check the vessel integrity.

Question to be answered !

1-Please recommend if the time assumption taken to calculate linear acceleration is reasonable. If not, what will be your advice.

2-Is there any better approach to solve this problem.

Thanks in advance

Anjum Riaz

-----Original Message-----

From: Factoo,Anjum via Xansys xansys-temp@list.xansys.org

Sent: Friday, September 20, 2024 11:44 AM

To: xansys-temp@list.xansys.org

Cc: Factoo,Anjum FACTOOA@airproducts.com

Subject: [External] [Xansys] [ANSYS] - Transient analysis - Fluid structure interaction

This email is from an external source. Please exercise caution in opening attachments or links.

Hello Everyone,

I am currently working on a problem where I need to capture the liquid sloshing effect inside a transportation cylindrical vessel and then map the pressure vs time load into structural environment.

Since liquid sloshing is a dynamic phenomenon. Ideally, I should have acceleration vs time data, so that we can apply it in our CFD environment and get pressure vs time load.

But currently, the site people don't have any acc. Vs time data. The only thing they know is that maximum site velocity (20kmph). Now, I need to concoct some acceleration vs time data.

Basic assumptions: The vessel is mounted on the trolley and will be used inside the facility under controlled conditions. The Max. speed limit at the site is 20kmph. The roads are paved.

Since I was not sure where to start. I used basic equation of motions to calculate acceleration.

Linear deceleration case (20kmph to 0kmph)

- I have assumed dt (change in time) as 0.1 sec, 0.25 sec, 0.5 sec, 0.75 sec & 1.0 sec, where 0.1 sec (dt) representing Hard Braking and 1.0 sec (dt) representing Normal Braking.

Cornering case

- Generate acceleration values for cornering (transverse direction) was more complex (lot of parameters to consider- turning radius, speed etc), therefore I assumed 0.5g,0.4g, 0.3g, 0.2g & 0.1g.

Question to be answered !

Please recommend if the time assumption taken to calculate linear acceleration is reasonable. If not, what will be your advice.

Best Regards

Anjum Riaz

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Hello Team,
Follow-up Info: Here are the 5 load cases that I have prepared.
Load case1: [dt =0.10 sec] [linear acc. = 55.6 m/s2] [transverse acc.= 0.5g]
Load case2: [dt =0.25 sec] [linear acc. = 22.2 m/s2] [transverse acc.= 0.4g]
Load case3: [dt =0.50 sec] [linear acc. = 11.1 m/s2] [transverse acc.= 0.3g]
Load case4: [dt =0.75 sec] [linear acc. = 7.41 m/s2] [transverse acc.= 0.2g]
Load case5: [dt =1.00 sec] [linear acc. = 5.56 m/s2] [transverse acc.= 0.1g]
Each load cases will be solved, just to capture the spectrum of loads. Since I don't have any site data.
Each load case will be transient in nature. Example Load case 1: Vessel with liquid will be accelerated for a period 0 to 0.1 sec with an acceleration of 55.6 m/s2 , after 0.1 sec the acceleration will be zero and the liquid sloshing will continue till the liquid velocity is zero (vel. is monitored). The results will be saved at each 0.1 sec. and then results from Fluent are transferred to transient structural to check the vessel integrity.
Question to be answered !
1-Please recommend if the time assumption taken to calculate linear acceleration is reasonable. If not, what will be your advice.
2-Is there any better approach to solve this problem.
Thanks in advance
Anjum Riaz
-----Original Message-----
From: Factoo,Anjum via Xansys <xansys-temp@list.xansys.org>
Sent: Friday, September 20, 2024 11:44 AM
To: xansys-temp@list.xansys.org
Cc: Factoo,Anjum <FACTOOA@airproducts.com>
Subject: [External] [Xansys] [ANSYS] - Transient analysis - Fluid structure interaction
This email is from an external source. Please exercise caution in opening attachments or links.
Hello Everyone,
I am currently working on a problem where I need to capture the liquid sloshing effect inside a transportation cylindrical vessel and then map the pressure vs time load into structural environment.
Since liquid sloshing is a dynamic phenomenon. Ideally, I should have acceleration vs time data, so that we can apply it in our CFD environment and get pressure vs time load.
But currently, the site people don't have any acc. Vs time data. The only thing they know is that maximum site velocity (20kmph). Now, I need to concoct some acceleration vs time data.
Basic assumptions: The vessel is mounted on the trolley and will be used inside the facility under controlled conditions. The Max. speed limit at the site is 20kmph. The roads are paved.
Since I was not sure where to start. I used basic equation of motions to calculate acceleration.
Linear deceleration case (20kmph to 0kmph)
* I have assumed dt (change in time) as 0.1 sec, 0.25 sec, 0.5 sec, 0.75 sec & 1.0 sec, where 0.1 sec (dt) representing Hard Braking and 1.0 sec (dt) representing Normal Braking.
Cornering case
* Generate acceleration values for cornering (transverse direction) was more complex (lot of parameters to consider- turning radius, speed etc), therefore I assumed 0.5g,0.4g, 0.3g, 0.2g & 0.1g.
Question to be answered !
Please recommend if the time assumption taken to calculate linear acceleration is reasonable. If not, what will be your advice.
Best Regards
Anjum Riaz
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