CFX converged solution input

UsamaQ · May 21, 2020, 10:13

Hello.

I have converged solution of a specific mass flow rate and speed but I want to run the simulation at different speed and mass flow rate.

How can I use previous converged simulation as input to solve other conditions so that simulation converged faster? Thank you.

Opaque · May 21, 2020, 11:15

Use it as an initial values file.

The initial values file does not need to have the same setup as the new simulation. If the operating condition is not too far off the previous one, the residual will jump and it should converge after some iterations

UsamaQ · May 21, 2020, 11:27

Quote:

Originally Posted by Opaque

Use it as an initial values file.

The initial values file does not need to have the same setup as the new simulation. If the operating condition is not too far off the previous one, the residual will jump and it should converge after some iterations

Do I need to export it in some format and then use it as initial condition?

Opaque · May 21, 2020, 11:50

Nope..

cfx5solve -def <my new run>.def -initial-file <my old run>.res

UsamaQ · May 21, 2020, 12:21

Quote:

Originally Posted by Opaque

Nope..

cfx5solve -def <my new run>.def -initial-file <my old run>.res

Hey, I am using GUI, not the command line. I am new to CFX.

Opaque · May 21, 2020, 13:00

Check the initial values tab in the UI when submitting the simulation, i.e. Execution Control

Sumanth_094 · May 29, 2020, 16:48

You could either mention the path to the initial result file in CFX Pre or in the CFX solver.

I usually do the initializing in the solver. Once you Define a run, the first tab is run definition and there tick the 'Show advanced controls'. This gets you access to 'initial values' tab. The rest, you should be able to figure out.

May 21, 2020, 10:13	CFX converged solution input	#1
UsamaQ Member Join Date: Mar 2020 Posts: 33 Rep Power: 6	Hello. I have converged solution of a specific mass flow rate and speed but I want to run the simulation at different speed and mass flow rate. How can I use previous converged simulation as input to solve other conditions so that simulation converged faster? Thank you.

May 21, 2020, 11:15		#2
Opaque Senior Member Join Date: Jun 2009 Posts: 1,804 Rep Power: 32	Use it as an initial values file. The initial values file does not need to have the same setup as the new simulation. If the operating condition is not too far off the previous one, the residual will jump and it should converge after some iterations __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

May 21, 2020, 11:50		#4
Opaque Senior Member Join Date: Jun 2009 Posts: 1,804 Rep Power: 32	Nope.. cfx5solve -def <my new run>.def -initial-file <my old run>.res __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

May 21, 2020, 13:00		#6
Opaque Senior Member Join Date: Jun 2009 Posts: 1,804 Rep Power: 32	Check the initial values tab in the UI when submitting the simulation, i.e. Execution Control __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
UDF for Automatic Solution Initialization for previous case data file	gartz89	Fluent UDF and Scheme Programming	6	March 30, 2020 07:38
Not getting converged solution in transient simulation	Julian121	CFX	6	April 27, 2019 02:00
Solution converged differently	aviral2000	Main CFD Forum	4	July 21, 2017 01:23
CFX Update failed for the Solution component. SEC crashed?	ClarPer	CFX	4	December 7, 2016 12:49
solution converged	shaswat	CFX	7	February 6, 2012 18:48

May 29, 2020, 16:48		#7
Sumanth_094 New Member Sumanth Join Date: Aug 2018 Location: Germany Posts: 21 Rep Power: 7	You could either mention the path to the initial result file in CFX Pre or in the CFX solver. I usually do the initializing in the solver. Once you Define a run, the first tab is run definition and there tick the 'Show advanced controls'. This gets you access to 'initial values' tab. The rest, you should be able to figure out.