HAM: DELPHIN 4, DIM 3.1

John Grunewald "Documentation of the Numerical Simulation Program DIM3.1", Volume 2: User's Guide. Delphin4.1 program installation available on the ftp-server of the Institute of Building Climatology: ftp://141.30.41.194

DIM3.1

The numerical simulation program DIM3.1 has been developed at the ?Institute of Building Climatologyˇ° of the Technical University of Dresden in order to support the investigation of the coupled heat, air, salt and moisture transport in porous building materials. The simulation of the thermal and hygric behaviour of constructive building details is possible for 1D, 2D and axialsymmetrical 3D problems. The program can be used in order to simulate transient mass and energy transport processes for arbitrary standard and natural climatic boundary conditions (temperature, relative humidity, driving rain, wind speed, wind direction, short and long wave radiation).

The modelling of transient transport processes leads into a system of non-linear partial differential equations. DIM3.1 solves the resulting system of coupled partial differential equations by numerical integration in time. A large number of variables (moisture contents, air pressures, salt concentrations, temperatures, diffusive and advective fluxes of liquid water, water vapour, air, salt, heat and enthalpy,...) which characterise the hygro-thermal state of building constructions, can be obtained as function of space and time. A particular advantage of the numerical simulation program is the possibility of investigation of variants concerning different constructions, different materials and different climatical loads. Constructive details of buildings and building materials can be optimised using the numerical simulation and the reliability of constructions for different given indoor and outdoor climates can be judged. The numerical simulation is a powerful tool in the field of building climatology, civil engineering and other disciplines today.


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