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Steady state solution as an initial condition for a transient problem 

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January 16, 2015, 16:21 
Steady state solution as an initial condition for a transient problem

#1 
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Adnan
Join Date: May 2012
Posts: 18
Rep Power: 11 
I am relatively new to FLUENT and have a question on solution initialization of a transient problem.
I am working on a transient problem which involves a fluid and a solid domain. (Similar to a quenching problem) The initial analysis that I did involves only the heat transfer in the fluid domain. For this case, I found out the steady state heat transfer solution. The next step involves the transient heat transfer in both fluid and solid domains. I want to give the steady state solution in the fluid as my initial condition. The solid is at a fixed temperature initially. When I look in the FLUENT options for solution initialization, I can only patch the liquid domain to a fixed temperature. Is there a way by which I can import the results of my steady state solution as an initial solution for the transient case? Thanks 

January 16, 2015, 23:16 

#2  
New Member
Zeng Liyue
Join Date: Sep 2014
Posts: 21
Rep Power: 8 
Quote:
You may do this: FileWriteCase&Data; FileInterpolate; ScreenClip1.jpg Write data and store a .ip file; then Read and Interpolate with that .ip file. 

January 16, 2015, 23:21 

#3 
New Member
Zeng Liyue
Join Date: Sep 2014
Posts: 21
Rep Power: 8 
.....Just after I reply with that solution, I realized that method applies to interpolating data between different mesh solutions...Now I think maybe FileReadData will do......


January 17, 2015, 03:06 

#4  
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Amin
Join Date: Oct 2013
Location: Germany
Posts: 396
Rep Power: 11 
Quote:
Did you run a steady state simulation in fluent!? if yes, of course that you can use these data for the transient simulation... 

January 17, 2015, 13:06 

#5 
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Adnan
Join Date: May 2012
Posts: 18
Rep Power: 11 
Thank you for the reply Amin and Soriyoshi.
Yes, I was able to run the steady state problem. The file read data would not work as it has 2 different meshes. (the steady state one with only the fluid and the transient one that I have with both the solid and fluid domains) So when I tried file read data I got an error saying the mesh is different. When I tried running the case by using the interpolation file, one problem that I faced was the values initialized weren't the same as the steady state solution. Instead a different fixed temperature was initialized in the liquid domain. Probably, because the coordinates of the steady state problem and the transient problem are different. I am not sure about this? Is there a way by which I can specify the coordinates of the region where the interpolation file should initialize the data? 

January 19, 2015, 13:26 

#6 
New Member
Adnan
Join Date: May 2012
Posts: 18
Rep Power: 11 
Hi,
I resolved the problem by solving the steady problem in the new domain by giving adiabatic conditions on the interface between the solid and liquid domain. I used that as my initial conditions and got the desired results. Thanks 

October 24, 2016, 14:01 

#7 
New Member
skywalker
Join Date: Oct 2016
Posts: 6
Rep Power: 6 
Hello every one, I have a similar problem here. I am simulating water hammer in a pipe. The flow is turbulent so I simulated the flow first for steady state before a sudden closure of the exit valve.
The B.C were a fixed static pressure at inlet, and a fixed flow rate at exit I need to use these conditions (including the generated velocity profile) as initial conditions for the transient simulation when the valve is suddenly closed. The B.c I want to use are : the same static pressure at inlet and 0 velocity at outlet ( or maybe 0 flow rate at outlet) I am not sure how I can do that in fluent. Thank you in advance for your help. 

November 25, 2016, 05:16 

#8  
Member

Quote:
I am going to conduct a similar numerical model. 

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