[esp-r] Re: warning messages from networks during simulation

[Aizaz Aamir Samuel]

Nuno,

This message appears when the flow network has not been able to converge. This
usually occurs when there is a mass imbalance at a node. Possible things to look
for:
1. Do all nodes have a path to external nodes (even when controls are active)
2. Is the network illdefined (e.g. a node may have air flowing to it through
some forced flow component but no means for the air to flow out from the node)

Usually it is best to draw the flow network on paper and then troubleshoot it.

-Aizaz

Quoting Nuno Fernandes <nuno.fernandes at mec.ua.pt>:

> Dear all esp-r users
> 
>  
> 
> I have a question related with fluid flow networks.
> 
>  
> 
> In my project I have a big zone that I have sub-divided. The contact
> surfaces between this zones (sub-divided) were set as transparent fictitious
> constructions.
> 
>  
> 
> Them I have set an all air fluid flow networks between them and define the
> components between the interior nodes as openings corresponding to all the
> contact area between the zones.
> 
>  
> 
> However when I rum the simulator a warning message appears:
> 
>  
> 
> Please check (in the following order) that:
> 
> -          each node has some flow path to a boundary pressure and
> 
> -          iteraction convergence control is not to strict.
> 
> Day 23 Month 12 Hour 13.00 : 100 iteractions: flows solution failed 
> 
>  
> 
>  
> 
> This happens for several days months and hours.
> 
>  
> 
> Can someone explain me watts’ wrong.
> 
>  
> 
> Thanks in advance.
> 
>  
> 
>  
> 
> Best regards,
> 
>  
> 
> Nuno Fernandes
> 
>  
> 
> ################################################# 
> 
>   Nuno Tiago Afonso Fernandes
> 
>  
> 
>   Universidade de Aveiro
> 
>   Departamento de Engenharia Mecânica
> 
>   Campus Universitário de Santiago  
> 
>   3810-193 Aveiro  
> 
>   Portugal
> 
>   Tel.: +351 234 370 830
> 
>   nuno.fernandes at mec.ua.pt
> 
>   www.ua.pt <http://www.ua.pt/> 
> 
> ##########################################################
> 
>  
> 
>  
> 
>