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Some examples of computer aided machine design.Full description
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visual basic for application examples
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VTT RAKENNUS- JA YHDYSKUNTATEKNIIKKA
FIRE DYNAMICS SIMULATOR (FDS) • FDS is currently currently the the most most advance advanced d and wide widely ly used used CFD-model for fire simulation. • It is mainly mainly devel developed oped at at Buildin Building g and Fire Fire Researc Research h Laboratory of NIST, USA (http://www.bfrl.nist.gov), in co-operation with VTT. • FDS has has an extrem extremely ely effic efficient ient flow flow solver solver comb combine ined d with the needs and concepts of fire safety business. • It’s freely freely downlo downloadab adable le from http:// http://fire. fire.nist nist.gov .gov/fds /fds//
VTT RAKENNUS- JA YHDYSKUNTATEKNIIKKA
Applications: Smoke transport • Fire plumes and smoke transport • Smoke ventilation • Fire detection simulations • Large fires • Forest fires
VTT RAKENNUS- JA YHDYSKUNTATEKNIIKKA
Smoke Transport Validation: Heating of a Non-combustible Cavity (FDS 1) • L = 6 m, W = 1.2 m & H = 0.6 m • Burner output 100 kW and 300 kW 500 Experiments, T2 6 m etäisyydellä T2 ontelon etupäästä
Experiments, T1 400
Calculated T2 Calculated, T1
lämpötila-anturi 3 m etäisyydellä T1 ontelon etupäästä
300
) C o ( T
200
burner poltin 100 100kW kW ja 300 kW 300 kW
100
.
0 0
300
600
time (s)
900
VTT RAKENNUS- JA YHDYSKUNTATEKNIIKKA
Applications: Sprinklers and water mist systems • FDS can be used to simulate the operation of water sprinklers and water mist systems. • The model contains • full two-phase flow equations • droplet evaporation • water transport at surfaces • interaction with radiation • The figure shows a simulation of a water mist suppression system inside a ship machinery room
VTT RAKENNUS- JA YHDYSKUNTATEKNIIKKA
Applications: Fire spread • Fire and flame spread are currently studied. • The attached examples show, how the experimental information on small (cone) and moderate (SBI) scales can be used to predict the heat release rate in full scale (Room corner test). ...continues... Simplistic cone calorimeter model
VTT RAKENNUS- JA YHDYSKUNTATEKNIIKKA
Single burning item test
Room corner test
VTT RAKENNUS- JA YHDYSKUNTATEKNIIKKA
Visual Validation of Fire Spread Predictions Partial Spruce-Board Lining in the ISO 9705 Room Poistoputki
RHR and smoke
Laskenta-alueen reuna
Savunkeräyskupu
2.40 m
240 cm (sisämitta)
80 cm
m 240 cm 0 (sisä 4 . mitta) 2
200 cm
kaasupoltin
doorw ay 2m ×0.8m 3.60 m
360 cm (sisämitta)
- Tutkittava verhoilu kammion seinien ja k aton sisäpinnassa - Lattia ja katto 20 cm paksua kevytbetonia
2 min
4 min
VTT RAKENNUS- JA YHDYSKUNTATEKNIIKKA
FDS3 Application: External Fire Spread In Glass Double-skin Facades Model tuning to reproduce the Law model temperatures in the case of a single-glazing facade 1000
Law model + Kokeet Heskestad correlation FDS-palosimulointi FDS
