how to add slide down effect without fade class in bootstrap modal

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bootstrap

In bootstrap modal I can't add the slide down effect if I remove fade class.I am using animate.css for giving animation effect.If I use fade class then the animate.css effect work with slide down effect but if I remove fade class,animate.css effect works without slidedown effect.

I'm using bounce effect of animate.css for modal open.So slidedown effect will be better to create the full effect.

You can see the difference by giving the class "modal fade animated bounce" and "modal animated bounce"

I have to remove the fade class for some reason.So don't tell to keep that.