Dynamic mesh-defining deforming motion in cylinder

matix_tx · July 31, 2014, 10:18

Hello, I need some help in defining dynamic zones. My simulation consist of half cylinder with a nozzle in one end and piston surface on the other end of half cylinder. I would like to simulate some kind of needle, pushing piston inside cylinder and fluid leaving needle through nozzle. I have made 3 fluid zones, upper is defined as rigid body (include boundary layers close to piston) and wrote UDF with constant velocity, lower zone is stationary, but i have problem with middle zone.
I defined deforming motion, but when i preview mesh motion it does not deform. This middle zone is cylindrical shape and consist of boundary layers and tetrahedral elements in center. Do i need to write UDF for middle zone and what is easy way to connect this deforming zone with rigid body movement???

Thank you for helping

matix_tx · August 1, 2014, 06:21

I have found out that only first cell in deforming zone is really deforming, others are fixed no matter which meshing option do i choose.

I someone have solution to this, please help

matix_tx · August 3, 2014, 10:49

After I preview zone motion, error:" Mesh projection of deforming dynamic zones exceeds reasonable limits." shows up.

MCD · December 6, 2022, 11:20

Hi matix_tx did you finally solve your issue?

July 31, 2014, 10:18	Dynamic mesh-defining deforming motion in cylinder	#1
matix_tx New Member Join Date: Jul 2014 Posts: 8 Rep Power: 12	Hello, I need some help in defining dynamic zones. My simulation consist of half cylinder with a nozzle in one end and piston surface on the other end of half cylinder. I would like to simulate some kind of needle, pushing piston inside cylinder and fluid leaving needle through nozzle. I have made 3 fluid zones, upper is defined as rigid body (include boundary layers close to piston) and wrote UDF with constant velocity, lower zone is stationary, but i have problem with middle zone. I defined deforming motion, but when i preview mesh motion it does not deform. This middle zone is cylindrical shape and consist of boundary layers and tetrahedral elements in center. Do i need to write UDF for middle zone and what is easy way to connect this deforming zone with rigid body movement??? Thank you for helping MCD likes this.

August 1, 2014, 06:21		#2
matix_tx New Member Join Date: Jul 2014 Posts: 8 Rep Power: 12	I have found out that only first cell in deforming zone is really deforming, others are fixed no matter which meshing option do i choose. I someone have solution to this, please help vivekanand sarade likes this.

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August 3, 2014, 10:49		#3
matix_tx New Member Join Date: Jul 2014 Posts: 8 Rep Power: 12	After I preview zone motion, error:" Mesh projection of deforming dynamic zones exceeds reasonable limits." shows up.

December 6, 2022, 11:20		#4
MCD New Member M. Davis Join Date: Dec 2022 Posts: 1 Rep Power: 0	Hi matix_tx did you finally solve your issue?