Steady-state or transient?

Ema · June 17, 2009, 06:06

Hi everyone!

I'm using V12, and in particular the thermal electric coupled analysis.
The simulation that I want analyze has to be transient, but actually it seems that using ANSYS workbench this is not possible.
Does somebody know what I must change and where to obtain a transient analysis?

Thanks in advance.
Ema

brajh11 · June 17, 2009, 07:20

In CFX Pre you go Simulation => simulation type=> there you can select option steady state or transient

Ema · June 17, 2009, 07:25

Hi,
Thanks!
I know that I can use the transient simulation in CFX, but do you think that importing an .inp steady-state file from thermal-electric in CFX the simulation that I will obtain is transient?
Thanks!!!!
Ema

ckleanth · June 17, 2009, 09:12

as far as i understand it for a coupled mechanical-cfx solution the two solvers need to run in parallel and exchange interface information

i dont know what the .inp file is as i for what i do never run anything coupled BUT in cfx a steady state simulation the timescale for each set of physics does not have to be the same. this is not the case for a transient simulation as every calculation needs to run at the same physical timescale. if the iteration from your mechanical simulation is considered as steady state regardless of the fluid iteration (I'm not sure if this is the case but go with me on this) essentially you dont want to run a coupled simulation but a transient cfx simulation and adding the mechanical source to your simulation. i hope this makes sense

Ema · June 17, 2009, 09:25

Thanks,
the problem is that my idea is to have a continuous excange of data from cfx to mechanical, and this is why I want have in every case a transient simulation.
The .inp file is something that I obtain writing the imput file, and once that I'm working on CFX I must upload this file, that contains data, loads and boundary conditions.
The problem is that reading the code I can be sure that this file, and so the relative simulation is static and not transient...
Thanks for your help,
Ema

hung · June 18, 2009, 23:03

Hi Ema,

Try tutorial 4 in CFX pre.

hung

June 17, 2009, 06:06	Steady-state or transient?	#1
Ema New Member Tuffy Join Date: Jun 2009 Posts: 28 Rep Power: 17	Hi everyone! I'm using V12, and in particular the thermal electric coupled analysis. The simulation that I want analyze has to be transient, but actually it seems that using ANSYS workbench this is not possible. Does somebody know what I must change and where to obtain a transient analysis? Thanks in advance. Ema

June 17, 2009, 09:12		#4
ckleanth Senior Member George Join Date: Mar 2009 Location: Birmingham, UK Posts: 257 Rep Power: 18	as far as i understand it for a coupled mechanical-cfx solution the two solvers need to run in parallel and exchange interface information i dont know what the .inp file is as i for what i do never run anything coupled BUT in cfx a steady state simulation the timescale for each set of physics does not have to be the same. this is not the case for a transient simulation as every calculation needs to run at the same physical timescale. if the iteration from your mechanical simulation is considered as steady state regardless of the fluid iteration (I'm not sure if this is the case but go with me on this) essentially you dont want to run a coupled simulation but a transient cfx simulation and adding the mechanical source to your simulation. i hope this makes sense __________________ Top 4 tips 1. Knowledge is everything and Ignorance is dangerous. 2. Understand your limitations and try to eliminate them. 3. Get yerself a bike and hoon the chuffer. You will soon learn why dogs like to hang their heads out the car window. 4. Please before asking any questions on how to run simulations in CFX, go though all the tutorials

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June 17, 2009, 07:20		#2
brajh11 New Member Bostjan Join Date: Apr 2009 Posts: 24 Rep Power: 17	In CFX Pre you go Simulation => simulation type=> there you can select option steady state or transient

June 17, 2009, 07:25		#3
Ema New Member Tuffy Join Date: Jun 2009 Posts: 28 Rep Power: 17	Hi, Thanks! I know that I can use the transient simulation in CFX, but do you think that importing an .inp steady-state file from thermal-electric in CFX the simulation that I will obtain is transient? Thanks!!!! Ema

June 17, 2009, 09:25		#5
Ema New Member Tuffy Join Date: Jun 2009 Posts: 28 Rep Power: 17	Thanks, the problem is that my idea is to have a continuous excange of data from cfx to mechanical, and this is why I want have in every case a transient simulation. The .inp file is something that I obtain writing the imput file, and once that I'm working on CFX I must upload this file, that contains data, loads and boundary conditions. The problem is that reading the code I can be sure that this file, and so the relative simulation is static and not transient... Thanks for your help, Ema

June 18, 2009, 23:03		#6
hung New Member hun Join Date: May 2009 Posts: 27 Rep Power: 17	Hi Ema, Try tutorial 4 in CFX pre. hung