[esp-r] Re: CFD problem

[Achim Geissler]

Dear Nalin

attached is your model in a configuration in which the air flow network to CFD conflation seems to be working (the thermal conflation is giving "Error: Invalid BC type" warnings, though). However, as you, I had the error messages you give. Additionally, prj hung at the message. A look at the source seems to imply that this message should not really happen at this point and should surely not hang prj. Maybe somebody on the list that has programmed in the CFD module can take a look.

The CFD is quite finicky in regard to convergence. At the beginning of the run, you may have to accept unconverged solutions as converged a few times. Having the large openings open to the exterior also leads to problems every few hours.

The entry for air flow network conflation in the .dfs file was done by hand.

Best regards
Achim



-----Original Message-----
From: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk] On Behalf Of NALIN SWAROOP
Sent: Montag, 4. Mai 2009 12:21
To: Hall,Monika
Cc: Aizaz Samuel; esp-r at lists.strath.ac.uk
Subject: [esp-r] Re: CFD problem

Dear Monika

The problem is not with the walls, I have conflated the CFD defined walls with the construction Walls and it works fine but if I try to conflate the openings with the network flow connection it gives the error "cells are not compatible with chosen face please redefine" I have again attached the CFD definition file the lines which define the airflow are not changed because ESP-r gives the above mentioned error.

Regards

Nalin







> Dear Nalin,
>
> Did you have tried a conflation of the walls like that?
>
> # Solid boundary conditions.
> *solids
> Wall3        Temp  25.00   | Confl   4  wallx
> Wall4        Temp  25.00   | Confl   3  wally
> Wall5        Temp  25.00   | Confl   11  wallz
>
>
> The walls created in cfd must related to the walls in the zone-model: p.e.
> wallx, wally and wallz
> But I don`t know  what are the numbers 4, 3, 11 for.
>
> Regards
> Monika
>
>
> -----Ursprüngliche Nachricht-----
> Von: esp-r-bounces at lists.strath.ac.uk
> [mailto:esp-r-bounces at lists.strath.ac.uk] Im Auftrag von NALIN SWAROOP
> Gesendet: Montag, 4. Mai 2009 08:39
> An: Aizaz Samuel
> Cc: esp-r at lists.strath.ac.uk
> Betreff: [esp-r] Re: CFD problem
>
> I changed the lines
>
> Open1        Whole    6  25   1   1  11  20
> Open2        Whole    6  25  25  25  11  20
>  to:
> Open1        South    6  25   1   1  11  20
> Open2        North    6  25  25  25  11  20
>
> and now grid error is not coming but still I am not able to do the CFD 
> and air flow network conflation every time I try to define the 
> boundary condition for open1 or open2 and choose the connections from 
> network flow it gives the error that "cells are not compatible with 
> chosen face please redefine"
>
> Please help
>
> Nalin
>
>
>
>
>
>
>
>
>
>
>> Nalin,
>>
>> In the cfd file change the following lines:
>> Open1        Whole    6  25   1   1  11  20
>> Open2        Whole    6  25  25  25  11  20
>>
>> to:
>> Open1        South    6  25   1   1  11  20
>> Open2    %2
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