tilting of a tank in two directions(multiple load steps)

sudhakar.mohan · June 20, 2012, 02:18

hi all ,

I m trying to tilt a simple fluid tank in an axis say x-axis for 2s and after that from 2s to 4s in z-axis , i m able to do the first step properly but could not able to do both the second load step. is it possible to complete both load step in a single run? right now i m picking intial value of first run(0 to 2s)for the second run(2 to 4s) but it doesnt work properly. please help.

singer1812 · June 20, 2012, 16:33

I assume you are doing this with mesh deformation?

Couple of ways of doing this.

First way: If you are using a version of CFX that allows case configurations, just do your normal simulation from 0-2seconds with the original mesh, for the first configuration. You will need to generate a new mesh that has the x axis rotation already built in. Then just do your z axis rotation from 2 to 4 seconds as the second configuration.

Second way: If you want to do this all with the same mesh, you will have be tricky with the rotation logic. If you are familiar with rotation matrices just set one up for a x rotation by angle theta, followed by a z rotation of angle phi and use the resulting x,y,z equations for your movement. The rotation angles will be a function of time with theta changing during 0 to 2 seconds and remaining constant after that and phi will be zero from 0 to 2 seconds and vary after that.

sudhakar.mohan · June 21, 2012, 05:05

hi edmund,

when the first configuration is over the water is filled half the tank in a inclined manner, how will generate a mesh of free surface of the fluid in the second configuration, please need some help

Quote:

Originally Posted by singer1812

I assume you are doing this with mesh deformation?

Couple of ways of doing this.

First way: If you are using a version of CFX that allows case configurations, just do your normal simulation from 0-2seconds with the original mesh, for the first configuration. You will need to generate a new mesh that has the x axis rotation already built in. Then just do your z axis rotation from 2 to 4 seconds as the second configuration.

Second way: If you want to do this all with the same mesh, you will have be tricky with the rotation logic. If you are familiar with rotation matrices just set one up for a x rotation by angle theta, followed by a z rotation of angle phi and use the resulting x,y,z equations for your movement. The rotation angles will be a function of time with theta changing during 0 to 2 seconds and remaining constant after that and phi will be zero from 0 to 2 seconds and vary after that.

June 20, 2012, 02:18	tilting of a tank in two directions(multiple load steps)	#1
sudhakar.mohan New Member sudhakar Join Date: Jun 2012 Posts: 3 Rep Power: 14	hi all , I m trying to tilt a simple fluid tank in an axis say x-axis for 2s and after that from 2s to 4s in z-axis , i m able to do the first step properly but could not able to do both the second load step. is it possible to complete both load step in a single run? right now i m picking intial value of first run(0 to 2s)for the second run(2 to 4s) but it doesnt work properly. please help. gencarif likes this.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
interFoam / bubbleFoam to simulate an aerated tank	Meratb	OpenFOAM Running, Solving & CFD	3	November 6, 2020 11:45
Filling Tank with Water	leff	CFX	7	August 21, 2017 07:47
Need Help! High pressure Gas discharge from tank to tank through a pipe	superarthur86	FLUENT	2	June 16, 2017 10:22
Cfd to ansys thermal to ansys structural interface	ssixr	ANSYS	17	July 31, 2015 15:18
Blow Tank Simulation ... Need Help!	treyevans	CFX	1	February 20, 2010 00:42

June 20, 2012, 16:33		#2
singer1812 Senior Member Edmund Singer P.E. Join Date: Aug 2010 Location: Minneapolis, MN Posts: 511 Rep Power: 21	I assume you are doing this with mesh deformation? Couple of ways of doing this. First way: If you are using a version of CFX that allows case configurations, just do your normal simulation from 0-2seconds with the original mesh, for the first configuration. You will need to generate a new mesh that has the x axis rotation already built in. Then just do your z axis rotation from 2 to 4 seconds as the second configuration. Second way: If you want to do this all with the same mesh, you will have be tricky with the rotation logic. If you are familiar with rotation matrices just set one up for a x rotation by angle theta, followed by a z rotation of angle phi and use the resulting x,y,z equations for your movement. The rotation angles will be a function of time with theta changing during 0 to 2 seconds and remaining constant after that and phi will be zero from 0 to 2 seconds and vary after that.