[TRNSYS-users] How to skip timesteps if they don't reach convergence?

[Javier Vega via TRNSYS-users]

Jeff,

When I say TRNEXE gets "stuck" I mean it stops calculating at a certain
timestep but TRNEXE doesn't close nor prints any message in the list file.
It just stops and I can't use any of the display options of the TRNEXE
window. When I check windows task administrator, TRNEXE is *Non-Responding*
but using somewhat 17% of my CPU. Also, my mouse cursor changes in the
TRNEXE window to the classical "loading" symbol.

I assume this is due to non convergence of a certain timestep? I was
thinking that because right now, if I start my simulation from Time=0,*
TRNEXE turns "Non-Responding" at the same timestep*.

I'm attaching a couple of images to illustrate the situation.

Kind regards,
Javier Vega






From: Jeff Thornton via TRNSYS-users <trnsys-users at lists.onebuilding.org>

To: trnsys-users at lists.onebuilding.org

Cc:

Bcc:

Date: Wed, 07 Jun 2017 16:09:54 -0500

Subject: Re: [TRNSYS-users] How to skip timesteps if they don't reach
convergence?

TRNSYS will iterate until the iteration limit is reached, write a warning
message to the list file, and then continue on to the next timestep.  When
you say TRNEXE gets "stuck" what do you mean?



Jeff



---

Jeff Thornton

President - TESS LLC

22 N. Carroll Street, Madison WI USA 53703

Office: (608) 274-2577  Fax: (608) 278-1475

www.tess-inc.com

E-Mail: thornton at tess-inc.com

On 06/07/2017 3:30 pm, Javier Vega via TRNSYS-users wrote:

Hello TRNSYS users,



I've noticed that some simulations finish with  messages that say that a
certain component (or components) doesn't reach convergence at certain
timesteps. The message is the following:



" The inputs to the listed units have not converged at this timestep. The
values at the last iteration will be used and the simulation will proceed."



Right now I'm doing a simulation with 5 min timestep that works well but
gets stuck at  hour 150, for example. If I change the simulation start time
everytime this happens so the simulation can continue, it keeps calculating
until  it gets stuck again 200 hours later.


I assume the TRNEXE gets stuck because of non convergence. Since the non
converged timesteps are neglectable, how can I set TRNSYS to automatically
ignore this timesteps and set the input/ouputs of the problematic units to
the previous ones?



Is there a chapter in the TRNSYS Documentation that I should check?



Thanks in advance,

Javier Vega


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