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Re: What are application purposes of Fluid Subdomains?
Kevin,
Heat exchangers typically always transfer heat from fluid to another. It could be water to water, water to air, refrigerant to air, refrigerant to water, ad infinitum. There is a tutorial on heat transfer that illustrates using fluid sub-domain to model heat exchange in a heat exchanger.
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Re: What are application purposes of Fluid Subdomains?
Ok, of course, I see that now. Sounds like a good common example, has anyone got a few more?
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Re: What are application purposes of Fluid Subdomains?
I do electronic packaging. The default fluid in my models is air. However I typically have a component in my assembly that is hermetically sealed package. This hermetically sealed package may either be a vacuum or an inert gas. I define this package as a fluid subdomain so I can change the air pressure to a vacuum or change the gas to something other than air.
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Re: What are application purposes of Fluid Subdomains?
Kevin,
I also find a fluid sub-domain useful in simulating ambient conditions surrounding the Flow model of interest. This on one project allowed me to relate wall temperatures on a pressure vessel with actual field measurements. Measuring temperatures inside vessels is not always possible but external temperatures are measurable. Of course the environment will have an effect which can be input as a BC. In this case I was trying to determine if two phase flow was present inside the vessel. If Flow predicted a wall temperature much higher than actual measured wasll temperature, then one possible explanation was a phase change inside the vessel.
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Re: What are application purposes of Fluid Subdomains?
Joe Galliera
Jul 18, 2011 4:11 PM
In the heat exchanger example that David mentions, you define the default fluid as air for the external fluid and select an internal face (Flow Sim automatically recognizes the open volume) to define the fluid sub-domain where you define this separate volume as water.
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Re: What are application purposes of Fluid Subdomains?
Joe Galliera
Jul 19, 2011 9:22 AM
Another point not related to subdomains, but similar to it for a transient analysis is Initial Conditions. You can define a region by a solid volume in SW and then in Flow disable that volume (so Flow thinks of this as a fluid) but assign different initial conditions to the volume than the global environmental/ambient conditions.
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