# Steady state solution as an initial condition for a transient problem

 Register Blogs Members List Search Today's Posts Mark Forums Read

 January 16, 2015, 16:21 Steady state solution as an initial condition for a transient problem #1 New Member   Adnan Join Date: May 2012 Posts: 18 Rep Power: 14 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: 11
Quote:
 Originally Posted by adnanakhtar 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
I have a solution in my Evernote but actually i haven't tried it yet, so if something is wrong, please correct me.
You may do this:
File-Write-Case&Data;

File-Interpolate;

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: 11 .....Just after I reply with that solution, I realized that method applies to interpolating data between different mesh solutions...Now I think maybe File-Read-Data will do......

January 17, 2015, 03:06
#4
Senior Member

Amin
Join Date: Oct 2013
Location: Germany
Posts: 397
Rep Power: 14
Quote:
 Originally Posted by adnanakhtar 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
Did you run a steady state simulation in fluent!?
if yes, of course that you can use these data for the transient simulation...

 January 19, 2015, 13:26 #6 New Member   Adnan Join Date: May 2012 Posts: 18 Rep Power: 14 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 arizwan likes this.

 October 24, 2016, 14:01 #7 New Member   skywalker Join Date: Oct 2016 Posts: 6 Rep Power: 9 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

Omid Seyedashraf
Join Date: May 2010
Posts: 49
Rep Power: 16
Quote:
 Originally Posted by M.Meki 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.
I am going to conduct a similar numerical model.