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#1 |
Member
naman doshi
Join Date: Oct 2017
Posts: 35
Rep Power: 8 ![]() |
I want to do mass balance, there are 2 vents (on the wall) and a cooler(rectangular area inside room) all of the dimensions 0.5*0.5m while using CFD-post function calculator area both vent comes to be 0.25m^2 while area for cooler is 0.5 m^2
Q1. how is it possible?? Q2. how do i do mass balance analysis? simulations are done on cfx. both vents are given as opening. cooler as inlet with 5m/s velocity. fulid is - humid air. sst model used please help. thanks in advance edit- i found the reason for the wrong area basically it is taking both faces of the area hence 0.25+0.25m^2= 0.5m^2 also in function calculator mass is coming of order 10^-5 which suggest that #mass going in that area of cooler =mass going out that area of cooler. Last edited by namandoshi; April 11, 2018 at 04:35. |
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#2 |
Senior Member
M
Join Date: Dec 2017
Posts: 692
Rep Power: 12 ![]() |
Can you add an image and maybe which expressions you used?
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#3 |
Senior Member
Gert-Jan
Join Date: Oct 2012
Location: Europe
Posts: 1,885
Rep Power: 27 ![]() |
It is very good that you check mass balance.
But you should already check your mass balance during the calculation. Therefore open the run in the solver manager, create a new monitor and select to plot all imbalances (mass & momentum). These should all go to zero, to assure mass balance. Alternatively create a monitor in the same way and plot the mass flows through the inlets and outlets. The sum should be zero. All these data are stored in each results file by default. So, also if you open a finished run, you can retrieve these data very easily. Much easier than in fluent, where I find this impossible ;-) |
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#4 |
Member
naman doshi
Join Date: Oct 2017
Posts: 35
Rep Power: 8 ![]() |
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#5 | |
Member
naman doshi
Join Date: Oct 2017
Posts: 35
Rep Power: 8 ![]() |
Quote:
Sir can you please explain step by step as I am working on cfx first time are this options in cfx-pre or solver? |
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#6 |
Senior Member
Gert-Jan
Join Date: Oct 2012
Location: Europe
Posts: 1,885
Rep Power: 27 ![]() |
I expect my explanation regarding the imbalances is clear enough since I didn't mention the word CFX-Pre.
Just go through the steps I described. Read my text. |
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