Where can we see simulations of a nuclear war?

I’d like to recommend the game DEFCON by Introversion Software. It’s not a proper war simulation but it is an excellent game/simulation regarding the concept of MAD. It’s fundamentally a game where you win by not being the biggest loser. It covers the building tensions and eventual first send and even third strike nuclear warfare quite well from a simplistic high level.

There's a bunch of FEMA stuff out there. Most of it is from the '80s and '90s but is probably still relevant.

https://nuke.fas.org/guide/usa/napb-90/annexb.pdf

http://www.radmeters4u.com/list.htm

https://commons.wikimedia.org/wiki/File:Fallout_map_USA_(FEM...

https://www.fema.gov/sites/default/files/documents/fema_plan...

Here's a quick post on it https://twitter.com/earthsukh/status/1498577111296221188

It's based on this video from Prof. Brian Toon: https://www.youtube.com/watch?v=AzwHbHlK5kI, who to my knowledge has done the most in depth studies on it.

There is a recent (2019) Princeton study of a large scale nuclear war between NATO and Russia [1]. They assume most strikes would be against military targets and predict immediate fatalities of "just" around 3% of the NATO+Russia's total population. While that does not count fallout and indirect effects, it seems far from apocalyptic (although some areas/countries are certain to be absolutely devastated). The more I read about it, the less clear it is to me that globally, a nuclear war would be worse than a large-scale WW2-style conventional conflict (during which, for example, over 20% of Polish population died).

On a more granular scale, Nukemaps [2], which probably everyone knows by now, shows the area of fallout for a given blast based on real-time wind data.

[1] https://www.icanw.org/new_study_on_us_russia_nuclear_war

[2] https://nuclearsecrecy.com/nukemap/

Not a nuclear war simulation, but what you’re asking about is the mission of NARAC at LLNL: https://narac.llnl.gov

NARAC monitors and predicts the spread of wind/water carried nuclear, biological, chemical, and other hazardous materials in emergencies. You can see videos of recent responses on their website; the highest profile one was probably the Fukushima disaster (if you remember the various evacuation recommendations, NARAC guided the US ones). Here are some more: https://narac.llnl.gov/about/timeline, including the Eyjafjallajökull volcano.

They run in some of their own (comparatively) smaller clusters for quick turnaround simulations, as well as on LLNL’s bigger HPC systems (https://hpc.llnl.gov/hardware/compute-platforms) when there’s a need.

They're not simulations of nuclear war per se, but read up on the Sigma War Games.

https://en.m.wikipedia.org/wiki/Sigma_war_games

https://nuclearsecrecy.com/nukemap/

https://youtu.be/2jy3JU-ORpo https://youtu.be/dxJHecyYBno Closest I can think of

not really a simulation but the movie “threads” gives what seems to be a very crude and realistic potential scenario viewed from the population standpoint.

Are there any estimates on the effect on world climate if we launch 10 nukes? 50? 100? 500? 1000?

If Russia is prevented from destroying military facilities in Ukraine, we will see nuclear war with our own eyes.

Why do you want to know?

This is a serious question. I'm asking because I find the hobby-level interest in nuclear war kind of offensive. It trivializes a profound threat to humanity.