additional subdomain source term

YJZ · July 13, 2010, 12:56

Hey, I'm trying to add a additional source term for the low Reynolds k-epsilon model. I specified the C2New as : p, li { white-space: pre-wrap; } (1.92-C2)*eps^2/k and CmiuNew as: p, li { white-space: preMiuWater+Cmiu*DenWater*(k^2)/eps. However, when I add these two sources in the subdomain as addition source term, it give me two errors :
Expression resolves to invalid units ('kg m^-1 s^-1') in value set for parameter 'Total Source' in object '/FLOW:Flow Analysis 1/DOMAIN

efault Domain/SUBDOMAIN:Subdomain 1/SOURCES/EQUATION SOURCE
:ed'. Expected units: 'kg m^2 s^-4'.
Expression resolves to invalid units ('m^2 s^-4') in value set for parameter 'Source' in object '/FLOW:Flow Analysis 1/DOMAIN

efault Domain/SUBDOMAIN:Subdomain 1/SOURCES/EQUATION SOURCE:ke'.
Expected units: 'W m^-3'.

Could someone provide advice on this please? Besides, What should I put under total source??

ghorrocks · July 13, 2010, 20:02

As the message says, you need to check the units of your calculation. It is wrong.

A work around is to just multiply by 1 [units], where [units] does the conversion into the correct units. But this is nothing but a dodgy fix - if your units are wrong you should fix them.

July 13, 2010, 12:56	additional subdomain source term	#1
YJZ New Member Join Date: Feb 2010 Posts: 2 Rep Power: 0	Hey, I'm trying to add a additional source term for the low Reynolds k-epsilon model. I specified the C2New as : p, li { white-space: pre-wrap; } (1.92-C2)eps^2/k and CmiuNew as: p, li { white-space: preMiuWater+CmiuDenWater*(k^2)/eps. However, when I add these two sources in the subdomain as addition source term, it give me two errors : Expression resolves to invalid units ('kg m^-1 s^-1') in value set for parameter 'Total Source' in object '/FLOW:Flow Analysis 1/DOMAINefault Domain/SUBDOMAIN:Subdomain 1/SOURCES/EQUATION SOURCE :ed'. Expected units: 'kg m^2 s^-4'. Expression resolves to invalid units ('m^2 s^-4') in value set for parameter 'Source' in object '/FLOW:Flow Analysis 1/DOMAINefault Domain/SUBDOMAIN:Subdomain 1/SOURCES/EQUATION SOURCE:ke'. Expected units: 'W m^-3'. Could someone provide advice on this please? Besides, What should I put under total source??

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July 13, 2010, 20:02		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,011 Rep Power: 146	As the message says, you need to check the units of your calculation. It is wrong. A work around is to just multiply by 1 [units], where [units] does the conversion into the correct units. But this is nothing but a dodgy fix - if your units are wrong you should fix them.