Modeling an arch

Alles zu DELPHIN, dem Programm zur hygrothermischen Bauteilsimulation.

Moderatoren: ghorwin, fechner, ruisinger

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Bina
Beiträge: 3
Registriert: 24 Mär 2021, 11:54

Modeling an arch

Beitrag von Bina »

Hi
I want to simulate this ceiling to fin the Temprature,Wind Solar and heat flow.
thanks
Bina
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fechner
Beiträge: 74
Registriert: 19 Dez 2018, 09:32

Re: The result

Beitrag von fechner »

Hello,

May you can explain a bit more? What exactly is the question?

First of all for Geometry Delphin can handle only rectangular constructions. In order to model the arch you can use a staircase-like construction. Keep in mind the increase of the surface. This can be handled by modifieing the exchange coefficient.
ghorwin
Beiträge: 29
Registriert: 03 Dez 2018, 13:49

Re: Modeling an arch

Beitrag von ghorwin »

Hi Bina,

this is actually a quite interesting question. As DELPHIN can only handle rectilinear geometries, we need to create a "representative substitution model". However, to got anywhere close to "representative", the actual question to be answered with the simulation is of interest.

For example, if you want to have local surface temperatures to evaluate the condensation risk, you might want to model just the weekest part of the construction (top of the arch), since that gives you the worst case.

If you want to model drying out of the construction (e.g. after refurbishment), you may want to use a slightly thicker column/beam representation.

In short: What is it you want to know when running the simulation?

Please let us know and then we might give you some idea on how to idealize the actual 3D geometry into something "representative".

-Andreas
Bina
Beiträge: 3
Registriert: 24 Mär 2021, 11:54

Re: Modeling an arch

Beitrag von Bina »

Hallo
vielen Dank für Ihre Antwort.
Es ist eine Adobe (nicht gebrannte Lehmziegel) Decke.
Ich brauche als Ergebnis, die Temperatur Außen und Innen in Oberfläche,
Feuhigkeit , der Effekt von Solar und Wärmeflus
Ich möchte über die verhalten von Strukture und Materialen erforschen.

Viele Grüße
Bina
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ghorwin
Beiträge: 29
Registriert: 03 Dez 2018, 13:49

Re: Modeling an arch

Beitrag von ghorwin »

Hi Bina,

my suggestion would be to simply put a rectangular grid over your construction drawing and idealize the geometry into some rectangular blocks. The more finegrained you do that, the more accurate the calculation will be. This requires some work - unless you do some scripting.

1. For example, you can create a colored sketch in your cad program with the arch drawn in scale.
2. Create a screenshot and cut the image to size.
3. Open your favourite paint program and paint over everything that's not part of the model.
4. re-scale the image (flat mode, no pixel interpolation to keep the original coloring) and save in reduced resolution
5. write a small python script that scans all pixels and converts each to a DELPHIN material assignment - use the color to map a material.

Agreed, this is something for master level engineering students with some programming background, but maybe you have someone around to help you with that. Otherwise idealize the sketch manually.

-Andreas
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