Saving array or matrix in UDM

vucrusader · January 29, 2016, 19:13

All,

For a user defined scalar function I wish to save cell center values of a given scalar at each iteration (similar to temperature, velocity etc. in fluent). To do so I believe that I have to use a user defined memory allocation. However, Fluent states that I am limited to 500 UDM variables.

If my discretization requires more than 500 cells, how do I save all of them?

Is the UDM variable simply a memory location (like a pointer in c) so that I could save an entire array or matrix in a single UDM variable or will I be able to save only one value (1) to a single UDM?

Regards,

`e` · January 31, 2016, 22:06

User-defined memory (UDM) is a real number value stored for each cell. For example, you could store the value of 2*T (temperature doubled) for every cell within one UDM. Have a read of the user-defined memory section in the UDF manual for examples and descriptions of the macros (F_UDMI, C_UDMI etc).

January 29, 2016, 19:13	Saving array or matrix in UDM	#1
vucrusader New Member Join Date: Jan 2016 Posts: 3 Rep Power: 10	All, For a user defined scalar function I wish to save cell center values of a given scalar at each iteration (similar to temperature, velocity etc. in fluent). To do so I believe that I have to use a user defined memory allocation. However, Fluent states that I am limited to 500 UDM variables. If my discretization requires more than 500 cells, how do I save all of them? Is the UDM variable simply a memory location (like a pointer in c) so that I could save an entire array or matrix in a single UDM variable or will I be able to save only one value (1) to a single UDM? Regards,

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January 31, 2016, 22:06		#2
`e` Senior Member Join Date: Mar 2015 Posts: 892 Rep Power: 18	User-defined memory (UDM) is a real number value stored for each cell. For example, you could store the value of 2*T (temperature doubled) for every cell within one UDM. Have a read of the user-defined memory section in the UDF manual for examples and descriptions of the macros (F_UDMI, C_UDMI etc).