# Scattered field

**URL:** <https://community.freefem.org/t/scattered-field/611>\
**Category:** General Discussion\
**Created:** [October 11, 2020, 10:19am UTC](https://community.freefem.org/t/scattered-field/611 "2020-10-11T10:19:18Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mordechaiy](https://avatars.discourse-cdn.com/v4/letter/m/cc9497/32.png) [@mordechaiy](https://community.freefem.org/u/mordechaiy)\
**Post date:** [October 11, 2020, 10:19am UTC](https://community.freefem.org/t/scattered-field/611/1 "2020-10-11T10:19:18Z")

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Hi every one,

I am trying to simulate a scatter field for the 2d wave equation using FF++.  
the code runs but the result is that the scattered field is always zero which clearly not true, it is zero until t=11, then waves should exit the scatterer location.  
please, can anyone check my code and tell me where is the error? [u scatter.edp](https://community.freefem.org/uploads/short-url/rwqzJYYS8mnnOBQ1q2gOPwuOo61.edp) (1.8 KB)

Thank you,  
Mordechai.