User Forum of Software BASEMENT

Hering

User

Registered: 2015-11-25

Posts: 5

restart.cgns-File funktioniert bei mir nicht

Was kann ich falsch machen?
Ich habe den output-Zeitschritt ganz klein gestellt (z.B. auf 60sec).
Dann habe ich nach 5 Minuten die Simulation gestoppt und dann unter INITIAL -1 eingegeben (-> es sollte der letzte Zeitschritt genommen werden).
Basement startet aber trotzdem bei null.
Das restart.cgns-File wird zu Beginn erstellt und verändert sich nicht.

Sam

Developer

From: VAW - ETH Zurich

Registered: 2014-09-04

Posts: 46

Website

Re: restart.cgns-File funktioniert bei mir nicht

could you please reformulate your issue in english?
in addition, to understand the problem you are facing, some information about the domain set up is needed (1D or 2D, pure hydraulics or with morphology?).

Hering

User

Registered: 2015-11-25

Posts: 5

Re: restart.cgns-File funktioniert bei mir nicht

restart.cgns-file does not work
(2D-Simulation, pure hydraulics)

What could I have done wrong?
I set the output timestep on 60sec to test the restart-option.
Then I started the simulation and stopped after 5 minutes.
I set INITIAL-1 (Basement should run from 5 minutes on).
But Basement started at timestep zero.
I saw thart the restart.cgns-file was produced once in the beginning, but did not change.

Stephan Kammerer

Developer

Registered: 2015-03-31

Posts: 67

Re: restart.cgns-File funktioniert bei mir nicht

Hi,

to restart  a 2D simulation from a certain state of a previous simulation, one can distinguish two scenarios:

(1) Start from the final state of the previous simulation

In the Block HYDRAULICS -> INITIAL, load the *.cgns-file and choose -1.0 as "restart_solution_time". In this case the last available solution is chosen from the restart file.

(2) Start from a specific solution given in the restart file:

Load the *.cgns-file and enter any time step  as "restart_solution_time", the program will then list all available times which are available.

In both cases it is important to set the "start_time" in the block TIMESTEP to -1.0 (default value).

Hope this solves your problem!
Stephan

Hering

User

Registered: 2015-11-25

Posts: 5

Re: restart.cgns-File funktioniert bei mir nicht

Thank you Mr. Kammerer.
It solved most of my problem.
(I had not defined the restart time step.)

I now have a new question:
Please explain me the difference between output time step and restart time step.
Why is it necessary to define both?

With kindly regards

Hering