Discussion Forum

Hi all,

I have the same problem!

Plus I have another issue about "study section". In my defined project I have two studies (first study divided by two section which are time dependent and consecutive to each other). Second study was linked to the first study.
How is it possible to link the second study to the first study with applying "a solution which combined of sol1 and sol2"?
Is it possible to do it in comsol?

Thanks in advance for sharing your information.
Sepideh

Hi,

I am also interested to know how to do the exact same thing !
It would be to do an animation for time intervals split in two studies (but continuous : one transient study followed the other by taking the last solution as initial solution).

Best regards,
Julien

You can create new dataset using join function. Right click on dataset and select 'join'. The operation can be explicit.

Hi Sohan,

thank you for your answer! I looked at the join feature before, but I was lost in the list of operations.

Now I tried with "explicit", but it still doesn't work...I think.

let's say I have Study1/Solution1 that goes from time 0 to 10 s, and Study2/Solution2 from 10 to 20 s.
I created a "Join 1" Data set, with "Explicit" combination.

In a surface plot, I select the Data Set "Join 1", but the Time drop-down list only goes from 0 to 10 s...

What did I do wrong ?

For the usage of join function, please follow the procedure below. See also the example.
1. Please create a Join node in Results -> Data Sets, and point the data
settings to the two existing data sets. Set the method of combination to
Explicit.

2. Create a Cut Point 2D node that points to Join 1.

3. Create a dummy time parameter t1 in Global Definitions -> Parameters.

4. Create a 1D Plot Group in Results and select Cut Point 2D 1 as the Data
set. Time selection should be set to Interpolated.

5. Create a Point Graph sub-node, whose Data set option is From parent. The
expression to plot is if(t>100,data2(T),data1(T)). This expression would
plot temperature from Study 1/Store Solution 1 for t = 0 to t = 100 and
using Study 1/Solution 1 for values of time > 100.

6. Use the same expression for a second Point Graph sub-node. This graph
uses interpolated time which points to the dummy time parameter t1. We will
use t1 to animate the plot. The Coloring and Style setting is set to show
only data points but no curves.

7. In Results -> Export, please create an animation whose subject is the 1D
Plot Group. In Animation Editing settings please set the sequence type to
Result parameter and set the parameter to t1. If you make t1 start from 0
and ends at 200, you will be able to plot data from both data sets.

Dear Sohan,

Thank you for your detailed answer and your example, but i think it does not apply to what I want to do.
I just want to animate a 2D surface plot of a certain variable (space charge density, in fact), with time-dependent results from two different studies, as explained before.

For now, I just avoid splitting the time interval and try to simulate everything in one go.

Combining the results of two time-dependent analyses into one ("Stitching" them together) is a capability that is being added in the soon-to-be-released version 5.3.
Watch the Release Highlight webinar:
www.comsol.com/community/forums/general/thread/140362/
Best,
Jeff