I would like to simulate a star exploding into a nova, ie 

[![enter image description here](https://i.stack.imgur.com/mqNst.jpg)](https://i.stack.imgur.com/mqNst.jpg)

I have a quick smoke where the density is keyframed, emitting smoke from a sphere for few frames only. I need a force that pushes this smoke in every directions, *uniformly*. Vorticity, noise, texture, collisions, high definition smoke, etc will do the job of modelizing the shape as it goes and offer nice details. I do not want to use a mesh.

But it doesn't seem to exist any force field that acts like a **sphere**, attracting or repulsing everything from a single point and *uniformly*. This is very easy programmatically so I surely missed something and I hope someone will point me to the correct feature ! Otherwise I'll have to learn a bit of python I guess.

**Wind** only pushes smoke in a single direction. I can make it a cone-wind, with an angle of 90° and both 2 directions, I can only get :

[![enter image description here](https://i.stack.imgur.com/ZL6kY.png)](https://i.stack.imgur.com/ZL6kY.png)
(Direction says : both Z, by the way gravity is off and the domain density and temperature parameters are 0).

I can put it to sphere of course, this is another frame but same : 

[![enter image description here](https://i.stack.imgur.com/pMkNo.png)](https://i.stack.imgur.com/pMkNo.png)
No idea why it raises upwards, same params as before, but anyway this is not even a sphere.

At last what approaches the most my needs is the "force" force field, in "sphere" mode, but it is absolutely not uniform : 

[![enter image description here](https://i.stack.imgur.com/pa0nO.png)](https://i.stack.imgur.com/pa0nO.png)
I don't know why it acts more on the horizontal plane. I tried to modify the domain resolution since the voxels grid contributes to non-uniformity anyway but even big resolutions end this way. 

I have to mention I also tried to expand an invisible sphere used as a collider, however I cannot use this then to get the vorticity, smoke effects precisely, that I am looking for. 

Any idea ?