[samantkumarnagraj]

Hello everyone,

I am new to the software. I am carrying out a solidification simulation. I have defined a user defined field function for fraction solidified w.r.t. time as

df/dt=exp(${F(t)})*${G(T)}

Here,

F(t)=F(t-1)-(1.047*pow(${Growth_Rate},3)*${Nucleation_Rate}*po w(${TimeStep},4))

G(t)=G(t-1)+(4.188*pow(${growth_rate},3)*${Nucleation_Rate} *pow(${TimeStep},3))

My question is, how can I use the data from the previous time step in the current time step?

Please help me out!

Thanks in advance.
Regards,
Samant Nagraj

[JBeilke]

Create a "Field mean Monitor" with "Time Step Frequency = 1" and "Sliding Sample Window Size = 1"

When you name the monitor "densityOld" you call it "$densityOldMonitor" in the FieldFunction.

[Pietro_]

Originally Posted by JBeilke

Create a "Field mean Monitor" with "Time Step Frequency = 1" and "Sliding Sample Window Size = 1"

When you name the monitor "densityOld" you call it "$densityOldMonitor" in the FieldFunction.

Actually I've learnt that in the version 9.06 the Sliding Sample Window Size should be 2, as a sliding windows of 1 give you the current value and not the previous one. You need to set the sliding windows to 2 and you will get the mean between the previous and the current value. So the expression to get previous time step value is:
2*${MeanValue(t-1)}-${YourValue(t)}
I hope it's clear