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ADVANCED
CFD
M
ODELING
ELECTRONICS
COOLING
DESIGN
OPTIONS
FOR
AIR
M
ANAGEM
ENT
Don Blanchet
3B Associates
02/01/2016
MODEL – VME CARD HIGH POWER PMC STUDY
Processor (s)
Heat sink
Air flow
30 watts
Total board Power = 130 watts
Optional
Heat spreader/
Stiffener
PMC position #2
PMC position #1
DUAL PMC CONFIGURATION WITH BASELINE HEAT SINK
DETAIL – HIGH DENSITY MEMORY DAUGHTER CARD
FPGA
Memory
assembly
BASELINE ALUMINUM HEAT SINK DESIGN
ALUMINUM HEAT SINK DESIGN – BOTTOM VIEW
ENHANCED HEAT SINK DESIGN - COPPER
ENHANCED HEAT SINK DESIGN COPPER – BOTTOM VIEW
DETAIL OF – PWB REMOVED – WITH HEAT SINK
FPGAFPGA
Baseline Heat sink
MECHANICAL DESIGN HEAT PIPE IMPLEMENTATION
Heat
spreaders
Heat Pipes
Processor
Heat sink
HEAT PIPE ENHANCED DESIGN
Main Processor
Heat sink
Heat Pipes integrated with main
Processor heat sink
FPGA
HEAT PIPE ENHANCED DESIGN – PMC PWB REMOVED
FPGA
Heat Pipes
HEAT PIPE ENHANCED DESIGN – PMC PWB REMOVED
FPGA
FPGA
Spreader
RESULTS – WITH BASELINE ALUMINUM HEAT SINK
Tj =85 C
40 C
Processors
Tj =78 C
Air flow
RESULTS – WITH BASELINE ALUMINUM HEAT SINK – MEMORY ARRAY
Processors
Tj =78 C
40 C
RESULTS – WITH ENHANCED COPPER HEAT SINK
40 C
Tj =80 C
RESULTS – WITH HEAT PIPES & SPREADER
Tj =78 C
40 C
RESULTS – BASELINE HEAT SINK DUAL PMC CONFIGURATION
40 C
Tj =85 C Tj =112 C Processors
Tj =92 C
RESULTS – BASELINE HEAT SINK DUAL HIGH POWER PMC
CONFIGURATION
40 C
Tj =90 C Tj =117 C Processors
Tj =93 C
RESULTS – BASELINE HEAT SINK DUAL PMC CONFIGURATION
MAX POWER = 22W PER PMC
40 C
Tj =78 C Tj =98 C
ENHANCED COPPER HEAT SINK DESIGN
BASELINE VS. ENHANCED HEAT SINK
BASELINE ALUMINUM VS. ENHANCED COPPER @ 25W EACH
Slot module air flow 20CFM 40C @ 10K feet
Tj =108 Tj =95
CFD TOOL – ORIGIN U.K.
The tool used has been customized for electronics cooling applications
over 20+ years.
Unfortunately it is lease only and VERY expensive $$$$$$$.
Looking forward to cloud rental options being more economical. ??

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Advanced cfd electronics cooling analyis