David McIlwaine starts on the right wing in place of Trimble, while Darren Cave returns to the backline at outside centre, with Luke Marshall moving inside to 12. Michael Allen is selected on the left wing, with Ian Porter picked at scrumhalf in place of Paul Marshall who is named on the bench.
Declan Fitzpatrick is selected at tighthead, while in the backrow Roger Wilson moves from Number 8 to blindside, Sean Doyle is named at openside with Nick Williams starting at Number 8.
Iain Henderson is named among the substitutes and will make his first appearance for Ulster this season if he comes on.
Looking ahead to the game, Ulster Head Coach, Mark Anscombe said: A good squad is one that can respond to poor performances and bounce back. What we have to do is to right the wrongs and get our accuracy a bit better than it was last week. If we can get that right then we can get a reasonable performance."
A limited number of tickets for the game are still available and can be purchased via www.ulsterrugby.com/tickets
The game will be shown live on BBC 2 Northern Ireland and on the BBC Sport website.
Ulster XV and replacements to face Glasgow Warriors, RaboDirect PRO12, Ravenhill Stadium, Friday 13th September (kick off 19:05); (15-9): J Payne, D McIlwaine, D Cave, L Marshall, M Allen, P Jackson, I Porter; (1-8): C Black, R Herring, D Fitzpatrick, J Muller (Captain), D Tuohy, R Wilson, S Doyle, N Williams; Replacements (16-23): N Annett, T Court, R Lutton, I Henderson, C Henry, P Marshall, J McKinney, R Andrew.
