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von fechner
18 Mär 2024, 16:46
Forum: Delphin
Thema: Inquiry Regarding Air Permeability Simulation
Antworten: 3
Zugriffe: 135

Re: Inquiry Regarding Air Permeability Simulation

Hello, The Kg value in the material data represents the air flow conductivity. It depends on the air tightness of the certain material. The only material in the Delphin database with a measured Kg is mineral wool. You can have a look there for reference values. The most other materials should have l...
von fechner
18 Dez 2023, 15:37
Forum: Delphin
Thema: Dampfdiffusionsaustauschkoeffizient
Antworten: 8
Zugriffe: 15524

Re: Dampfdiffusionsaustauschkoeffizient

Die Kontaktbedingungen sind notwendig bei Luftschichten über größere Temperaturdifferenzen und bei belüfteten Luftschichten.
Wenn man unsicher ist kann man diese Kontaktbedingungen auch einfach immer verenden.
von fechner
13 Dez 2023, 09:51
Forum: Delphin
Thema: Database (Materials)
Antworten: 3
Zugriffe: 868

Re: Database (Materials)

Hello, This is a different error. The mwu(T) function will be created normally from existing moisture storage function. This function is only used if the ice model is switched on. You have to change the mwu(T) function directly. Do the folowing things: - open material in material editor in DELPHIN -...
von fechner
11 Dez 2023, 15:23
Forum: Delphin
Thema: Database (Materials)
Antworten: 3
Zugriffe: 868

Re: Database (Materials)

Hello, Some materials in our database doesn't fit the strong check rules for material data. Normally such problems does not lead to simulation problems. You can switch off the check in the solver settings - see checkbox 'Use strict material function checks'. If you switch it off the simulation will ...
von fechner
26 Nov 2023, 21:34
Forum: Delphin
Thema: Inquiry regarding Porosity and Gas Phase Volume Fraction in the DELPHIN Model
Antworten: 3
Zugriffe: 1561

Re: Inquiry regarding Porosity and Gas Phase Volume Fraction in the DELPHIN Model

I have forwarded your request to Mr. Nicolai. He should be able to help you.
von fechner
08 Nov 2023, 10:54
Forum: Delphin
Thema: Inquiry regarding Porosity and Gas Phase Volume Fraction in the DELPHIN Model
Antworten: 3
Zugriffe: 1561

Re: Inquiry regarding Porosity and Gas Phase Volume Fraction in the DELPHIN Model

Hello,

1. We have in a material data set two values
- porosity - this is the absolut porosity
- effective moisture content - this is the amount of pores reachable by capillary transport

2.
Yes, you are right. In presence of ice this is taken into account

Best regards
Heiko Fechner
von fechner
14 Sep 2023, 13:49
Forum: Delphin
Thema: Too long simulation times
Antworten: 1
Zugriffe: 43841

Re: Too long simulation times

Hello, First of all a DELPHIN project doesn't contain the material properties. Please attach a project package the next time. Such a package contains also materials and climate. Normally if you simulate an airflow through a structure its a good idea only to set a air pressure boundary condition at m...
von fechner
18 Jul 2023, 09:52
Forum: Delphin
Thema: source AirChange for ventilated gap
Antworten: 1
Zugriffe: 1919

Re: source AirChange for ventilated gap

Hello Alexandra, To your questions. 1) Yes, a discretisation is necessary 2) Yes, you can use the air from the database with the higher lambda value corrsponding to the thickness of the gap. The surface coefficients can be modelled by using the ai-material-boundary contact conditions. This doesn't a...
von fechner
18 Mai 2023, 18:43
Forum: Delphin
Thema: Climate Conditions Input
Antworten: 2
Zugriffe: 2745

Re: Climate Conditions Input

Here also a example file
von fechner
18 Mai 2023, 18:39
Forum: Delphin
Thema: Climate Conditions Input
Antworten: 2
Zugriffe: 2745

Re: Climate Conditions Input

Hello,

best is using tsv files (tabulator separated values) with the following format

Code: Alles auswählen

Time [unit] Value1 [unit] …
time value

Example:

time [d] temperature [C]
0 -2
0.2 -4
0.5 4
1 -1
1.4 -4
.