Remove corn kernels from cobs with a knife; reserve cobs and 1 cup of kernels.
Heat oil in a large pot over medium heat. Add garlic; sauté until fragrant, about 1 minute. Add jalapeno and onions; sauté until soft, about 5 minutes. Add celery, cumin and turmeric; cook for about 1 or 2 minutes more.
Add broth, water and cobs; bring to a boil. Reduce heat to low and simmer for about 15 minutes; remove and discard cobs. Add corn (except for cup of reserved kernels), salt and pepper to soup; simmer for 15 minutes more.
Puree soup until smooth in pot using an immersion blender (or in a food processor or in batches in a blender—but be careful not to splatter hot liquid). Garnish with red pepper, cilantro, scallion and reserved cup of corn; serve hot or at room temperature. Yields about 1 cup per serving.