How to set user points for volumetric flow rate[m^3/h]

Motofumi · September 14, 2021, 02:49

Hi,

I'm new to Ansys CFX. I checked the manuals and tutorials, but couldn't find the answer. I'm sorry if this question is very simple.

I want to monitor the volume flow rate [m^3/h] at the inlet part when calculating the solver, so I made an expression to calculate the volume flow rate [m^3/h] in Expressions.

The formula is this:
abs (massFlow () @Inlet) / massFlowAve (Density) @Inlet * 60 [s] / 1 [h]

However, when monitoring using this formula, the unit is [m^3/s] on the graph screen of user points.
What can I change to monitor [m^3/h]?

I look forward to your comments.
Kind regards,

Motofumi

Opaque · September 14, 2021, 08:56

You cannot change the time units for a specific monitored quantity.

The ANSYS CFX Solver work in "Solution Units", see CFX-Pre/Edit Options, and select the units for the time dimension you want.

Keep in mind that changing time from [s] to [hr] will change all the time-related quantities to be [hr] based instead of [s] based.

FrankW · September 14, 2021, 11:19

If you are only interested in the value, you can use the following expression:

abs (massFlow()@Inlet) / massFlowAve(Density)@Inlet*1[hr]/1[m^3]

September 14, 2021, 02:49	How to set user points for volumetric flow rate[m^3/h]	#1
Motofumi New Member Motofumi Join Date: Sep 2021 Posts: 2 Rep Power: 0	Hi, I'm new to Ansys CFX. I checked the manuals and tutorials, but couldn't find the answer. I'm sorry if this question is very simple. I want to monitor the volume flow rate [m^3/h] at the inlet part when calculating the solver, so I made an expression to calculate the volume flow rate [m^3/h] in Expressions. The formula is this: abs (massFlow () @Inlet) / massFlowAve (Density) @Inlet * 60 [s] / 1 [h] However, when monitoring using this formula, the unit is [m^3/s] on the graph screen of user points. What can I change to monitor [m^3/h]? I look forward to your comments. Kind regards, Motofumi

September 14, 2021, 08:56		#2
Opaque Senior Member Join Date: Jun 2009 Posts: 1,880 Rep Power: 33	You cannot change the time units for a specific monitored quantity. The ANSYS CFX Solver work in "Solution Units", see CFX-Pre/Edit Options, and select the units for the time dimension you want. Keep in mind that changing time from [s] to [hr] will change all the time-related quantities to be [hr] based instead of [s] based. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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September 14, 2021, 11:19		#3
FrankW Member Frank Weise Join Date: Mar 2009 Location: Germany Posts: 55 Rep Power: 17	If you are only interested in the value, you can use the following expression: abs (massFlow()@Inlet) / massFlowAve(Density)@Inlet*1[hr]/1[m^3]