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January 22, 2013 9:59am UTC in response to Samuele Lilliu

Re: Two interdependent studies - but I cannot use results from frequency domain study as input for stationary study

Too hard question?

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January 22, 2013 7:41pm UTC in response to Alexander Kuznetsov

Re: Two interdependent studies - but I cannot use results from frequency domain study as input for stationary study

Dear Alexander,

This is the model:
www.lilliu.co.uk/comsol/model2...0-%20pin%20diode%20-%20R27.mph

Study 1 contains a parametric sweep (incidence angle) and a frequency domain study. The resulting Poyinting vector is used as the input for a function defined in Model1->Definitions->Var1, which is:

G = multFactPower*(powerFlowDiv)/(c_const*h_plank/lambda_1)
powerFlow = abs(d(emw.Poavx, x)+d(emw.Poavy, y)+d(emw.Poavz, z))

where powerFlow is defined in Var2.

Study 2 contains two stationary steps. The first one involves just the electrostatics node (init), the second one involves an electrostatics node (es) and two transport of diluted species (cde, cdh). The variable G, which contains the solutions from Study 1 is an input for the transport of dilutes species, nodes Reactions 1 (in both of them).

The problem is that G is actually a function of: data Sets (can be Solution 6, Solution 1), frequency (just one) and angle (from the parametric sweep). In fact when you want to plot G, as shown in Results->Generation Rate (light) you chose these three parameters: solution, frequency and angle.

At the moment G is present in the reaction nodes, but how do I tell COMSOL that my G is actually:

G(Solution 6 - light parametric, freq, incidenceAngle) ?

At the moment the two Studies can be computed. However the result, which is shown in Results -> Current Density (voltage sweep) does not show any photogenerated current (J corresponding to V = 0) - it shows only saturation current.

As you can see from the plot Results-> Generation Rate (light) you have a plot of G, but also G_beer. The last one is calculated with the Beer-Lambert Law, and almost coincide to the G computed from my simulation. You can also add a small multiplication fact so that they match exactly, but this does not make any difference.

Now if you change the name to G_beer with G and you run again the two studies, you will notice that a photocurrent is actually present (should be something around 10mA/cm^2),

For this reason I am actually thinking that the function that is actually passed to the reaction terms is ZERO.

I was thinking that this could be due to the fact that G is defined as a local variable. However if you define a global variable as:

G = multFactPower*(powerFlowDiv)/(c_const*h_plank/lambda_1)
powerFlow = abs(d(mod1.emw.Poavx, x)+d(mod1.emw.Poavy, y)+d(mod1.emw.Poavz, z))

it does not change anything.

So, how can I pass:

G(Solution 6 - light parametric, freq, incidenceAngle)

to the second study?

Thanks in advance

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January 22, 2013 10:51pm UTC in response to Samuele Lilliu

Re: Two interdependent studies - but I cannot use results from frequency domain study as input for stationary study

www.lilliu.co.uk/comsol/model2...0-%20pin%20diode%20-%20R27.mph

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January 25, 2013 7:11am UTC in response to Samuele Lilliu

Re: Two interdependent studies - but I cannot use results from frequency domain study as input for stationary study

Dear all,

Is the question complicated or stupid? I cannot find anything on the manual. Do you know anyone that could know the answer? Please let me know, and I'll send him a private message,

Thanks in advance

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May 13, 2013 3:10am UTC in response to Samuele Lilliu

Re: Two interdependent studies - but I cannot use results from frequency domain study as input for stationary study

Hi,
Have you solve the problem？I have the same question,too.
Best

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